Initial content

2024-05-29 18:54:49 +01:00 · 2024-05-29 18:54:49 +01:00 · 5215a1d919
commit 5215a1d919
parent 2dbc1a8088
1944 changed files with 203378 additions and 0 deletions
--- a/02/tools/hello.js
+++ b/02/tools/hello.js
@ -0,0 +1 @@
+console.log("Hello, World");
--- a/02/tools/message.js
+++ b/02/tools/message.js
@ -0,0 +1,4 @@
+function writeMessage(msg) {
+    console.log("Message: ".concat(msg));
+}
+writeMessage("This is the new message");
--- a/02/tools/message.ts
+++ b/02/tools/message.ts
@ -0,0 +1,5 @@
+function writeMessage(msg: string) {
+    console.log(`Message: ${msg}`);
+}
+
+writeMessage("This is the new message");
--- a/02/tools/package-lock.json
+++ b/02/tools/package-lock.json
@ -0,0 +1,612 @@
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+      "dev": true,
+      "bin": {
+        "tsc": "bin/tsc",
+        "tsserver": "bin/tsserver"
+      },
+      "engines": {
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+      }
+    },
+    "node_modules/undefsafe": {
+      "version": "2.0.5",
+      "resolved": "https://registry.npmjs.org/undefsafe/-/undefsafe-2.0.5.tgz",
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+      "dev": true
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+      "dev": true,
+      "dependencies": {
+        "isexe": "^2.0.0"
+      },
+      "bin": {
+        "node-which": "bin/node-which"
+      },
+      "engines": {
+        "node": ">= 8"
+      }
+    }
+  }
+}
--- a/02/tools/package.json
+++ b/02/tools/package.json
@ -0,0 +1,22 @@
+{
+  "name": "tools",
+  "version": "1.0.0",
+  "description": "",
+  "main": "hello.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1",
+    "start": "tsc-watch message.ts --onSuccess \"node message.js\"",
+    "go": "tsc message.ts && node message.js"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "bootstrap": "^5.3.0"
+  },
+  "devDependencies": {
+    "nodemon": "^2.0.20",
+    "tsc-watch": "^6.0.4",
+    "typescript": "^5.2.2"
+  }
+}
--- a/03/primer/index.js
+++ b/03/primer/index.js
@ -0,0 +1,7 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+const modules_1 = require("./modules");
+let name = new modules_1.Name("Adam", "Freeman");
+let loc = new modules_1.WeatherLocation("raining", "London");
+console.log(name.nameMessage);
+console.log(loc.weatherMessage);
--- a/03/primer/index.ts
+++ b/03/primer/index.ts
@ -0,0 +1,7 @@
+import { Name, WeatherLocation } from "./modules";
+
+let name = new Name("Adam", "Freeman");
+let loc = new WeatherLocation("raining", "London");
+
+console.log(name.nameMessage);
+console.log(loc.weatherMessage);
--- a/03/primer/modules/index.js
+++ b/03/primer/modules/index.js
@ -0,0 +1,7 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.WeatherLocation = exports.Name = void 0;
+var name_1 = require("./name");
+Object.defineProperty(exports, "Name", { enumerable: true, get: function () { return name_1.Name; } });
+var weather_1 = require("./weather");
+Object.defineProperty(exports, "WeatherLocation", { enumerable: true, get: function () { return weather_1.WeatherLocation; } });
--- a/03/primer/modules/index.ts
+++ b/03/primer/modules/index.ts
@ -0,0 +1,2 @@
+export { Name } from "./name";
+export { WeatherLocation } from "./weather";
--- a/03/primer/modules/name.js
+++ b/03/primer/modules/name.js
@ -0,0 +1,15 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.Name = void 0;
+class Name {
+    first;
+    second;
+    constructor(first, second) {
+        this.first = first;
+        this.second = second;
+    }
+    get nameMessage() {
+        return `Hello ${this.first} ${this.second}`;
+    }
+}
+exports.Name = Name;
--- a/03/primer/modules/name.ts
+++ b/03/primer/modules/name.ts
@ -0,0 +1,7 @@
+export class Name {
+    constructor(public first: string, public second: string) {}
+
+    get nameMessage() {
+        return `Hello ${this.first} ${this.second}`;
+    }
+}
--- a/03/primer/modules/weather.js
+++ b/03/primer/modules/weather.js
@ -0,0 +1,15 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.WeatherLocation = void 0;
+class WeatherLocation {
+    weather;
+    city;
+    constructor(weather, city) {
+        this.weather = weather;
+        this.city = city;
+    }
+    get weatherMessage() {
+        return `It is ${this.weather} in ${this.city}`;
+    }
+}
+exports.WeatherLocation = WeatherLocation;
--- a/03/primer/modules/weather.ts
+++ b/03/primer/modules/weather.ts
@ -0,0 +1,7 @@
+export class WeatherLocation {
+    constructor(public weather: string, public city: string) {}
+
+    get weatherMessage() {
+        return `It is ${this.weather} in ${this.city}`;
+    }
+}
--- a/03/primer/package-lock.json
+++ b/03/primer/package-lock.json
@ -0,0 +1,541 @@
+{
+  "name": "primer",
+  "version": "1.0.0",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "primer",
+      "version": "1.0.0",
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+        "typescript": "^5.2.2"
+      }
+    },
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+    },
+    "node_modules/@types/node": {
+      "version": "20.6.1",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-20.6.1.tgz",
+      "integrity": "sha512-4LcJvuXQlv4lTHnxwyHQZ3uR9Zw2j7m1C9DfuwoTFQQP4Pmu04O6IfLYgMmHoOCt0nosItLLZAH+sOrRE0Bo8g=="
+    },
+    "node_modules/abbrev": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/abbrev/-/abbrev-1.1.1.tgz",
+      "integrity": "sha512-nne9/IiQ/hzIhY6pdDnbBtz7DjPTKrY00P/zvPSm5pOFkl6xuGrGnXn/VtTNNfNtAfZ9/1RtehkszU9qcTii0Q=="
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+        "picomatch": "^2.0.4"
+      },
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+      "engines": {
+        "node": ">=8"
+      },
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+        "url": "https://github.com/sponsors/sindresorhus"
+      }
+    },
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+      "version": "1.1.11",
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+      "dependencies": {
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+      },
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+      }
+    },
+    "node_modules/chokidar": {
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+}
--- a/03/primer/package.json
+++ b/03/primer/package.json
@ -0,0 +1,20 @@
+{
+  "name": "primer",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "use_js": "nodemon",
+    "use_ts": "tsc-watch --onSuccess \"node index.js\""
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "@tsconfig/node20": "^20.1.4",
+    "@types/node": "^20.6.1",
+    "nodemon": "^2.0.20",
+    "tsc-watch": "^6.0.4",
+    "typescript": "^5.2.2"
+  }
+}
--- a/03/primer/tsconfig.json
+++ b/03/primer/tsconfig.json
@ -0,0 +1,3 @@
+{
+    "extends": "@tsconfig/node20/tsconfig.json"
+}
--- a/04/webapp/data.json
+++ b/04/webapp/data.json
@ -0,0 +1,14 @@
+{
+    "products": [
+        { "id": 1, "name": "Kayak", "category": "Watersports", 
+            "description": "A boat for one person", "price": 275 },
+        { "id": 2, "name": "Lifejacket", "category": "Watersports", 
+            "description": "Protective and fashionable", "price": 48.95 },
+        { "id": 3, "name": "Soccer Ball", "category": "Soccer", 
+            "description": "FIFA-approved size and weight", 
+            "price": 19.50 },
+        { "id": 4, "name": "Corner Flags", "category": "Soccer", 
+            "description": "Give your playing field a professional touch", 
+            "price": 34.95 }
+    ]
+}
--- a/04/webapp/package-lock.json
+++ b/04/webapp/package-lock.json
@ -0,0 +1,230 @@
+{
+  "name": "webapp",
+  "version": "1.0.0",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
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+      "name": "webapp",
+      "version": "1.0.0",
+      "license": "ISC",
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+      },
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+        "tsc-watch": "^6.0.4",
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+      "dev": true
+    },
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+      "version": "20.6.1",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-20.6.1.tgz",
+      "integrity": "sha512-4LcJvuXQlv4lTHnxwyHQZ3uR9Zw2j7m1C9DfuwoTFQQP4Pmu04O6IfLYgMmHoOCt0nosItLLZAH+sOrRE0Bo8g=="
+    },
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+      "dev": true,
+      "dependencies": {
+        "path-key": "^3.1.0",
+        "shebang-command": "^2.0.0",
+        "which": "^2.0.1"
+      },
+      "engines": {
+        "node": ">= 8"
+      }
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+      "dev": true
+    },
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+      "version": "3.3.4",
+      "resolved": "https://registry.npmjs.org/event-stream/-/event-stream-3.3.4.tgz",
+      "integrity": "sha512-QHpkERcGsR0T7Qm3HNJSyXKEEj8AHNxkY3PK8TS2KJvQ7NiSHe3DDpwVKKtoYprL/AreyzFBeIkBIWChAqn60g==",
+      "dev": true,
+      "dependencies": {
+        "duplexer": "~0.1.1",
+        "from": "~0",
+        "map-stream": "~0.1.0",
+        "pause-stream": "0.0.11",
+        "split": "0.3",
+        "stream-combiner": "~0.0.4",
+        "through": "~2.3.1"
+      }
+    },
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+      "resolved": "https://registry.npmjs.org/from/-/from-0.1.7.tgz",
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+      "dev": true
+    },
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+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/isexe/-/isexe-2.0.0.tgz",
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+      "dev": true
+    },
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+      "version": "0.1.0",
+      "resolved": "https://registry.npmjs.org/map-stream/-/map-stream-0.1.0.tgz",
+      "integrity": "sha512-CkYQrPYZfWnu/DAmVCpTSX/xHpKZ80eKh2lAkyA6AJTef6bW+6JpbQZN5rofum7da+SyN1bi5ctTm+lTfcCW3g==",
+      "dev": true
+    },
+    "node_modules/node-cleanup": {
+      "version": "2.1.2",
+      "resolved": "https://registry.npmjs.org/node-cleanup/-/node-cleanup-2.1.2.tgz",
+      "integrity": "sha512-qN8v/s2PAJwGUtr1/hYTpNKlD6Y9rc4p8KSmJXyGdYGZsDGKXrGThikLFP9OCHFeLeEpQzPwiAtdIvBLqm//Hw==",
+      "dev": true
+    },
+    "node_modules/path-key": {
+      "version": "3.1.1",
+      "resolved": "https://registry.npmjs.org/path-key/-/path-key-3.1.1.tgz",
+      "integrity": "sha512-ojmeN0qd+y0jszEtoY48r0Peq5dwMEkIlCOu6Q5f41lfkswXuKtYrhgoTpLnyIcHm24Uhqx+5Tqm2InSwLhE6Q==",
+      "dev": true,
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/pause-stream": {
+      "version": "0.0.11",
+      "resolved": "https://registry.npmjs.org/pause-stream/-/pause-stream-0.0.11.tgz",
+      "integrity": "sha512-e3FBlXLmN/D1S+zHzanP4E/4Z60oFAa3O051qt1pxa7DEJWKAyil6upYVXCWadEnuoqa4Pkc9oUx9zsxYeRv8A==",
+      "dev": true,
+      "dependencies": {
+        "through": "~2.3"
+      }
+    },
+    "node_modules/ps-tree": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/ps-tree/-/ps-tree-1.2.0.tgz",
+      "integrity": "sha512-0VnamPPYHl4uaU/nSFeZZpR21QAWRz+sRv4iW9+v/GS/J5U5iZB5BNN6J0RMoOvdx2gWM2+ZFMIm58q24e4UYA==",
+      "dev": true,
+      "dependencies": {
+        "event-stream": "=3.3.4"
+      },
+      "bin": {
+        "ps-tree": "bin/ps-tree.js"
+      },
+      "engines": {
+        "node": ">= 0.10"
+      }
+    },
+    "node_modules/shebang-command": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/shebang-command/-/shebang-command-2.0.0.tgz",
+      "integrity": "sha512-kHxr2zZpYtdmrN1qDjrrX/Z1rR1kG8Dx+gkpK1G4eXmvXswmcE1hTWBWYUzlraYw1/yZp6YuDY77YtvbN0dmDA==",
+      "dev": true,
+      "dependencies": {
+        "shebang-regex": "^3.0.0"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/shebang-regex": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/shebang-regex/-/shebang-regex-3.0.0.tgz",
+      "integrity": "sha512-7++dFhtcx3353uBaq8DDR4NuxBetBzC7ZQOhmTQInHEd6bSrXdiEyzCvG07Z44UYdLShWUyXt5M/yhz8ekcb1A==",
+      "dev": true,
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/split": {
+      "version": "0.3.3",
+      "resolved": "https://registry.npmjs.org/split/-/split-0.3.3.tgz",
+      "integrity": "sha512-wD2AeVmxXRBoX44wAycgjVpMhvbwdI2aZjCkvfNcH1YqHQvJVa1duWc73OyVGJUc05fhFaTZeQ/PYsrmyH0JVA==",
+      "dev": true,
+      "dependencies": {
+        "through": "2"
+      },
+      "engines": {
+        "node": "*"
+      }
+    },
+    "node_modules/stream-combiner": {
+      "version": "0.0.4",
+      "resolved": "https://registry.npmjs.org/stream-combiner/-/stream-combiner-0.0.4.tgz",
+      "integrity": "sha512-rT00SPnTVyRsaSz5zgSPma/aHSOic5U1prhYdRy5HS2kTZviFpmDgzilbtsJsxiroqACmayynDN/9VzIbX5DOw==",
+      "dev": true,
+      "dependencies": {
+        "duplexer": "~0.1.1"
+      }
+    },
+    "node_modules/string-argv": {
+      "version": "0.3.2",
+      "resolved": "https://registry.npmjs.org/string-argv/-/string-argv-0.3.2.tgz",
+      "integrity": "sha512-aqD2Q0144Z+/RqG52NeHEkZauTAUWJO8c6yTftGJKO3Tja5tUgIfmIl6kExvhtxSDP7fXB6DvzkfMpCd/F3G+Q==",
+      "dev": true,
+      "engines": {
+        "node": ">=0.6.19"
+      }
+    },
+    "node_modules/through": {
+      "version": "2.3.8",
+      "resolved": "https://registry.npmjs.org/through/-/through-2.3.8.tgz",
+      "integrity": "sha512-w89qg7PI8wAdvX60bMDP+bFoD5Dvhm9oLheFp5O4a2QF0cSBGsBX4qZmadPMvVqlLJBBci+WqGGOAPvcDeNSVg==",
+      "dev": true
+    },
+    "node_modules/tsc-watch": {
+      "version": "6.0.4",
+      "resolved": "https://registry.npmjs.org/tsc-watch/-/tsc-watch-6.0.4.tgz",
+      "integrity": "sha512-cHvbvhjO86w2aGlaHgSCeQRl+Aqw6X6XN4sQMPZKF88GoP30O+oTuh5lRIJr5pgFWrRpF1AgXnJJ2DoFEIPHyg==",
+      "dev": true,
+      "dependencies": {
+        "cross-spawn": "^7.0.3",
+        "node-cleanup": "^2.1.2",
+        "ps-tree": "^1.2.0",
+        "string-argv": "^0.3.1"
+      },
+      "bin": {
+        "tsc-watch": "dist/lib/tsc-watch.js"
+      },
+      "engines": {
+        "node": ">=12.12.0"
+      },
+      "peerDependencies": {
+        "typescript": "*"
+      }
+    },
+    "node_modules/typescript": {
+      "version": "5.2.2",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-5.2.2.tgz",
+      "integrity": "sha512-mI4WrpHsbCIcwT9cF4FZvr80QUeKvsUsUvKDoR+X/7XHQH98xYD8YHZg7ANtz2GtZt/CBq2QJ0thkGJMHfqc1w==",
+      "dev": true,
+      "bin": {
+        "tsc": "bin/tsc",
+        "tsserver": "bin/tsserver"
+      },
+      "engines": {
+        "node": ">=14.17"
+      }
+    },
+    "node_modules/which": {
+      "version": "2.0.2",
+      "resolved": "https://registry.npmjs.org/which/-/which-2.0.2.tgz",
+      "integrity": "sha512-BLI3Tl1TW3Pvl70l3yq3Y64i+awpwXqsGBYWkkqMtnbXgrMD+yj7rhW0kuEDxzJaYXGjEW5ogapKNMEKNMjibA==",
+      "dev": true,
+      "dependencies": {
+        "isexe": "^2.0.0"
+      },
+      "bin": {
+        "node-which": "bin/node-which"
+      },
+      "engines": {
+        "node": ">= 8"
+      }
+    }
+  }
+}
--- a/04/webapp/package.json
+++ b/04/webapp/package.json
@ -0,0 +1,20 @@
+{
+  "name": "webapp",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "start": "tsc-watch --onsuccess \"node dist/server.js\""
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "devDependencies": {
+    "@tsconfig/node20": "^20.1.2",
+    "tsc-watch": "^6.0.4",
+    "typescript": "^5.2.2"
+  },
+  "dependencies": {
+    "@types/node": "^20.6.1"
+  }
+}
--- a/04/webapp/src/count_promise.ts
+++ b/04/webapp/src/count_promise.ts
@ -0,0 +1,29 @@
+import { Worker } from "worker_threads";
+
+export const Count = (request: number, 
+        iterations: number, total: number) : Promise<void> => {
+
+    return new Promise<void>((resolve, reject) => {
+
+        const worker = new Worker(__dirname + "/count_worker.js", {
+            workerData: {
+                iterations, total, request
+            }
+        });
+
+        worker.on("message", (iter) => {
+            const msg = `Request: ${request}, Iteration: ${(iter)}`;            
+            console.log(msg);            
+        }); 
+
+       worker.on("exit", (code) => {
+            if (code !== 0) {
+                reject();
+            } else {
+                resolve();
+            }
+        });
+        
+       worker.on("error", reject);        
+    });
+}
--- a/04/webapp/src/count_worker.ts
+++ b/04/webapp/src/count_worker.ts
@ -0,0 +1,12 @@
+import { workerData, parentPort  } from "worker_threads";
+
+console.log(`Worker thread ${workerData.request} started`);
+
+for (let iter = 0; iter < workerData.iterations; iter++) {
+    for (let count = 0; count < workerData.total; count++) {
+        count++;
+    }
+    parentPort?.postMessage(iter);
+}
+
+console.log(`Worker thread ${workerData.request} finished`);
--- a/04/webapp/src/counter_cb.ts
+++ b/04/webapp/src/counter_cb.ts
@ -0,0 +1,25 @@
+import { Worker } from "worker_threads";
+
+export const Count = (request: number, iterations: number, total: number, 
+        callback: (err: Error | null, update: number | boolean) => void) => {
+
+    const worker = new Worker(__dirname + "/count_worker.js", {
+        workerData: {
+            iterations, 
+            total, 
+            request
+        }
+    });
+    
+    worker.on("message", async (iter: number) => {
+        callback(null, iter);
+    });
+    
+    worker.on("exit", async (code: number) => {
+        callback(code === 0 ? null : new Error(), true);
+    });
+    
+    worker.on("error", async (err) => {
+        callback(err, true);
+    });        
+}
--- a/04/webapp/src/handler.ts
+++ b/04/webapp/src/handler.ts
@ -0,0 +1,23 @@
+import { IncomingMessage, ServerResponse } from "http";
+import { endPromise, writePromise } from "./promises";
+//import { Count } from "./counter_cb";
+import { Count } from "./count_promise";
+
+const total = 2_000_000_000;
+const iterations = 15;
+let shared_counter = 0;
+
+export const handler = async (req: IncomingMessage, res: ServerResponse) => {
+    const request = shared_counter++;
+
+    try {
+        await Count(request, iterations, total);
+        const msg = `Request: ${request}, Iterations: ${(iterations)}`;        
+        await writePromise.bind(res)(msg + "\n");                   
+        await endPromise.bind(res)("Done");        
+    } catch (err: any) {
+        console.log(err);
+        res.statusCode = 500;
+        res.end();
+    }
+};
--- a/04/webapp/src/promises.ts
+++ b/04/webapp/src/promises.ts
@ -0,0 +1,8 @@
+import { ServerResponse } from "http";
+import { promisify } from "util";
+
+export const endPromise = promisify(ServerResponse.prototype.end) as 
+    (data: any) => Promise<void>;
+
+export const writePromise = promisify(ServerResponse.prototype.write) as
+    (data: any) => Promise<void>;
--- a/04/webapp/src/server.ts
+++ b/04/webapp/src/server.ts
@ -0,0 +1,21 @@
+import { createServer } from "http";
+import { handler } from "./handler";
+
+const port = 5000;
+
+const server = createServer();
+
+server.on("request", (req, res) => {
+    if (req.url?.endsWith("favicon.ico")) {
+        res.statusCode = 404;
+        res.end();
+    } else {
+        handler(req, res)
+    }
+});
+
+server.listen(port);
+
+server.on("listening", () => {
+    console.log(`(Event) Server listening on port ${port}`);
+});
--- a/04/webapp/tsconfig.json
+++ b/04/webapp/tsconfig.json
@ -0,0 +1,8 @@
+{
+    "extends": "@tsconfig/node20/tsconfig.json",
+     "compilerOptions": {                       
+         "rootDir": "src",   
+         "outDir": "dist",                                    
+     }
+ }
+ 
--- a/Chapter/webapp/data.json
+++ b/Chapter/webapp/data.json
@ -0,0 +1,14 @@
+{
+    "products": [
+        { "id": 1, "name": "Kayak", "category": "Watersports", 
+            "description": "A boat for one person", "price": 275 },
+        { "id": 2, "name": "Lifejacket", "category": "Watersports", 
+            "description": "Protective and fashionable", "price": 48.95 },
+        { "id": 3, "name": "Soccer Ball", "category": "Soccer", 
+            "description": "FIFA-approved size and weight", 
+            "price": 19.50 },
+        { "id": 4, "name": "Corner Flags", "category": "Soccer", 
+            "description": "Give your playing field a professional touch", 
+            "price": 34.95 }
+    ]
+}
--- a/Chapter/webapp/dist/count_promise.js
+++ b/Chapter/webapp/dist/count_promise.js
@ -0,0 +1,27 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.Count = void 0;
+const worker_threads_1 = require("worker_threads");
+const Count = (request, iterations, total) => {
+    return new Promise((resolve, reject) => {
+        const worker = new worker_threads_1.Worker(__dirname + "/count_worker.js", {
+            workerData: {
+                iterations, total, request
+            }
+        });
+        worker.on("message", (iter) => {
+            const msg = `Request: ${request}, Iteration: ${(iter)}`;
+            console.log(msg);
+        });
+        worker.on("exit", (code) => {
+            if (code !== 0) {
+                reject();
+            }
+            else {
+                resolve();
+            }
+        });
+        worker.on("error", reject);
+    });
+};
+exports.Count = Count;
--- a/Chapter/webapp/dist/count_worker.js
+++ b/Chapter/webapp/dist/count_worker.js
@ -0,0 +1,11 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+const worker_threads_1 = require("worker_threads");
+console.log(`Worker thread ${worker_threads_1.workerData.request} started`);
+for (let iter = 0; iter < worker_threads_1.workerData.iterations; iter++) {
+    for (let count = 0; count < worker_threads_1.workerData.total; count++) {
+        count++;
+    }
+    worker_threads_1.parentPort?.postMessage(iter);
+}
+console.log(`Worker thread ${worker_threads_1.workerData.request} finished`);
--- a/Chapter/webapp/dist/counter_cb.js
+++ b/Chapter/webapp/dist/counter_cb.js
@ -0,0 +1,23 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.Count = void 0;
+const worker_threads_1 = require("worker_threads");
+const Count = (request, iterations, total, callback) => {
+    const worker = new worker_threads_1.Worker(__dirname + "/count_worker.js", {
+        workerData: {
+            iterations,
+            total,
+            request
+        }
+    });
+    worker.on("message", async (iter) => {
+        callback(null, iter);
+    });
+    worker.on("exit", async (code) => {
+        callback(code === 0 ? null : new Error(), true);
+    });
+    worker.on("error", async (err) => {
+        callback(err, true);
+    });
+};
+exports.Count = Count;
--- a/Chapter/webapp/dist/handler.js
+++ b/Chapter/webapp/dist/handler.js
@ -0,0 +1,24 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.handler = void 0;
+const promises_1 = require("./promises");
+//import { Count } from "./counter_cb";
+const count_promise_1 = require("./count_promise");
+const total = 2000000000;
+const iterations = 15;
+let shared_counter = 0;
+const handler = async (req, res) => {
+    const request = shared_counter++;
+    try {
+        await (0, count_promise_1.Count)(request, iterations, total);
+        const msg = `Request: ${request}, Iterations: ${(iterations)}`;
+        await promises_1.writePromise.bind(res)(msg + "\n");
+        await promises_1.endPromise.bind(res)("Done");
+    }
+    catch (err) {
+        console.log(err);
+        res.statusCode = 500;
+        res.end();
+    }
+};
+exports.handler = handler;
--- a/Chapter/webapp/dist/promises.js
+++ b/Chapter/webapp/dist/promises.js
@ -0,0 +1,7 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.writePromise = exports.endPromise = void 0;
+const http_1 = require("http");
+const util_1 = require("util");
+exports.endPromise = (0, util_1.promisify)(http_1.ServerResponse.prototype.end);
+exports.writePromise = (0, util_1.promisify)(http_1.ServerResponse.prototype.write);
--- a/Chapter/webapp/dist/server.js
+++ b/Chapter/webapp/dist/server.js
@ -0,0 +1,19 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+const http_1 = require("http");
+const handler_1 = require("./handler");
+const port = 5000;
+const server = (0, http_1.createServer)();
+server.on("request", (req, res) => {
+    if (req.url?.endsWith("favicon.ico")) {
+        res.statusCode = 404;
+        res.end();
+    }
+    else {
+        (0, handler_1.handler)(req, res);
+    }
+});
+server.listen(port);
+server.on("listening", () => {
+    console.log(`(Event) Server listening on port ${port}`);
+});
--- a/Chapter/webapp/package-lock.json
+++ b/Chapter/webapp/package-lock.json
@ -0,0 +1,230 @@
+{
+  "name": "webapp",
+  "version": "1.0.0",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "webapp",
+      "version": "1.0.0",
+      "license": "ISC",
+      "dependencies": {
+        "@types/node": "^20.6.1"
+      },
+      "devDependencies": {
+        "@tsconfig/node20": "^20.1.2",
+        "tsc-watch": "^6.0.4",
+        "typescript": "^5.2.2"
+      }
+    },
+    "node_modules/@tsconfig/node20": {
+      "version": "20.1.2",
+      "resolved": "https://registry.npmjs.org/@tsconfig/node20/-/node20-20.1.2.tgz",
+      "integrity": "sha512-madaWq2k+LYMEhmcp0fs+OGaLFk0OenpHa4gmI4VEmCKX4PJntQ6fnnGADVFrVkBj0wIdAlQnK/MrlYTHsa1gQ==",
+      "dev": true
+    },
+    "node_modules/@types/node": {
+      "version": "20.6.1",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-20.6.1.tgz",
+      "integrity": "sha512-4LcJvuXQlv4lTHnxwyHQZ3uR9Zw2j7m1C9DfuwoTFQQP4Pmu04O6IfLYgMmHoOCt0nosItLLZAH+sOrRE0Bo8g=="
+    },
+    "node_modules/cross-spawn": {
+      "version": "7.0.3",
+      "resolved": "https://registry.npmjs.org/cross-spawn/-/cross-spawn-7.0.3.tgz",
+      "integrity": "sha512-iRDPJKUPVEND7dHPO8rkbOnPpyDygcDFtWjpeWNCgy8WP2rXcxXL8TskReQl6OrB2G7+UJrags1q15Fudc7G6w==",
+      "dev": true,
+      "dependencies": {
+        "path-key": "^3.1.0",
+        "shebang-command": "^2.0.0",
+        "which": "^2.0.1"
+      },
+      "engines": {
+        "node": ">= 8"
+      }
+    },
+    "node_modules/duplexer": {
+      "version": "0.1.2",
+      "resolved": "https://registry.npmjs.org/duplexer/-/duplexer-0.1.2.tgz",
+      "integrity": "sha512-jtD6YG370ZCIi/9GTaJKQxWTZD045+4R4hTk/x1UyoqadyJ9x9CgSi1RlVDQF8U2sxLLSnFkCaMihqljHIWgMg==",
+      "dev": true
+    },
+    "node_modules/event-stream": {
+      "version": "3.3.4",
+      "resolved": "https://registry.npmjs.org/event-stream/-/event-stream-3.3.4.tgz",
+      "integrity": "sha512-QHpkERcGsR0T7Qm3HNJSyXKEEj8AHNxkY3PK8TS2KJvQ7NiSHe3DDpwVKKtoYprL/AreyzFBeIkBIWChAqn60g==",
+      "dev": true,
+      "dependencies": {
+        "duplexer": "~0.1.1",
+        "from": "~0",
+        "map-stream": "~0.1.0",
+        "pause-stream": "0.0.11",
+        "split": "0.3",
+        "stream-combiner": "~0.0.4",
+        "through": "~2.3.1"
+      }
+    },
+    "node_modules/from": {
+      "version": "0.1.7",
+      "resolved": "https://registry.npmjs.org/from/-/from-0.1.7.tgz",
+      "integrity": "sha512-twe20eF1OxVxp/ML/kq2p1uc6KvFK/+vs8WjEbeKmV2He22MKm7YF2ANIt+EOqhJ5L3K/SuuPhk0hWQDjOM23g==",
+      "dev": true
+    },
+    "node_modules/isexe": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/isexe/-/isexe-2.0.0.tgz",
+      "integrity": "sha512-RHxMLp9lnKHGHRng9QFhRCMbYAcVpn69smSGcq3f36xjgVVWThj4qqLbTLlq7Ssj8B+fIQ1EuCEGI2lKsyQeIw==",
+      "dev": true
+    },
+    "node_modules/map-stream": {
+      "version": "0.1.0",
+      "resolved": "https://registry.npmjs.org/map-stream/-/map-stream-0.1.0.tgz",
+      "integrity": "sha512-CkYQrPYZfWnu/DAmVCpTSX/xHpKZ80eKh2lAkyA6AJTef6bW+6JpbQZN5rofum7da+SyN1bi5ctTm+lTfcCW3g==",
+      "dev": true
+    },
+    "node_modules/node-cleanup": {
+      "version": "2.1.2",
+      "resolved": "https://registry.npmjs.org/node-cleanup/-/node-cleanup-2.1.2.tgz",
+      "integrity": "sha512-qN8v/s2PAJwGUtr1/hYTpNKlD6Y9rc4p8KSmJXyGdYGZsDGKXrGThikLFP9OCHFeLeEpQzPwiAtdIvBLqm//Hw==",
+      "dev": true
+    },
+    "node_modules/path-key": {
+      "version": "3.1.1",
+      "resolved": "https://registry.npmjs.org/path-key/-/path-key-3.1.1.tgz",
+      "integrity": "sha512-ojmeN0qd+y0jszEtoY48r0Peq5dwMEkIlCOu6Q5f41lfkswXuKtYrhgoTpLnyIcHm24Uhqx+5Tqm2InSwLhE6Q==",
+      "dev": true,
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/pause-stream": {
+      "version": "0.0.11",
+      "resolved": "https://registry.npmjs.org/pause-stream/-/pause-stream-0.0.11.tgz",
+      "integrity": "sha512-e3FBlXLmN/D1S+zHzanP4E/4Z60oFAa3O051qt1pxa7DEJWKAyil6upYVXCWadEnuoqa4Pkc9oUx9zsxYeRv8A==",
+      "dev": true,
+      "dependencies": {
+        "through": "~2.3"
+      }
+    },
+    "node_modules/ps-tree": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/ps-tree/-/ps-tree-1.2.0.tgz",
+      "integrity": "sha512-0VnamPPYHl4uaU/nSFeZZpR21QAWRz+sRv4iW9+v/GS/J5U5iZB5BNN6J0RMoOvdx2gWM2+ZFMIm58q24e4UYA==",
+      "dev": true,
+      "dependencies": {
+        "event-stream": "=3.3.4"
+      },
+      "bin": {
+        "ps-tree": "bin/ps-tree.js"
+      },
+      "engines": {
+        "node": ">= 0.10"
+      }
+    },
+    "node_modules/shebang-command": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/shebang-command/-/shebang-command-2.0.0.tgz",
+      "integrity": "sha512-kHxr2zZpYtdmrN1qDjrrX/Z1rR1kG8Dx+gkpK1G4eXmvXswmcE1hTWBWYUzlraYw1/yZp6YuDY77YtvbN0dmDA==",
+      "dev": true,
+      "dependencies": {
+        "shebang-regex": "^3.0.0"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/shebang-regex": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/shebang-regex/-/shebang-regex-3.0.0.tgz",
+      "integrity": "sha512-7++dFhtcx3353uBaq8DDR4NuxBetBzC7ZQOhmTQInHEd6bSrXdiEyzCvG07Z44UYdLShWUyXt5M/yhz8ekcb1A==",
+      "dev": true,
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/split": {
+      "version": "0.3.3",
+      "resolved": "https://registry.npmjs.org/split/-/split-0.3.3.tgz",
+      "integrity": "sha512-wD2AeVmxXRBoX44wAycgjVpMhvbwdI2aZjCkvfNcH1YqHQvJVa1duWc73OyVGJUc05fhFaTZeQ/PYsrmyH0JVA==",
+      "dev": true,
+      "dependencies": {
+        "through": "2"
+      },
+      "engines": {
+        "node": "*"
+      }
+    },
+    "node_modules/stream-combiner": {
+      "version": "0.0.4",
+      "resolved": "https://registry.npmjs.org/stream-combiner/-/stream-combiner-0.0.4.tgz",
+      "integrity": "sha512-rT00SPnTVyRsaSz5zgSPma/aHSOic5U1prhYdRy5HS2kTZviFpmDgzilbtsJsxiroqACmayynDN/9VzIbX5DOw==",
+      "dev": true,
+      "dependencies": {
+        "duplexer": "~0.1.1"
+      }
+    },
+    "node_modules/string-argv": {
+      "version": "0.3.2",
+      "resolved": "https://registry.npmjs.org/string-argv/-/string-argv-0.3.2.tgz",
+      "integrity": "sha512-aqD2Q0144Z+/RqG52NeHEkZauTAUWJO8c6yTftGJKO3Tja5tUgIfmIl6kExvhtxSDP7fXB6DvzkfMpCd/F3G+Q==",
+      "dev": true,
+      "engines": {
+        "node": ">=0.6.19"
+      }
+    },
+    "node_modules/through": {
+      "version": "2.3.8",
+      "resolved": "https://registry.npmjs.org/through/-/through-2.3.8.tgz",
+      "integrity": "sha512-w89qg7PI8wAdvX60bMDP+bFoD5Dvhm9oLheFp5O4a2QF0cSBGsBX4qZmadPMvVqlLJBBci+WqGGOAPvcDeNSVg==",
+      "dev": true
+    },
+    "node_modules/tsc-watch": {
+      "version": "6.0.4",
+      "resolved": "https://registry.npmjs.org/tsc-watch/-/tsc-watch-6.0.4.tgz",
+      "integrity": "sha512-cHvbvhjO86w2aGlaHgSCeQRl+Aqw6X6XN4sQMPZKF88GoP30O+oTuh5lRIJr5pgFWrRpF1AgXnJJ2DoFEIPHyg==",
+      "dev": true,
+      "dependencies": {
+        "cross-spawn": "^7.0.3",
+        "node-cleanup": "^2.1.2",
+        "ps-tree": "^1.2.0",
+        "string-argv": "^0.3.1"
+      },
+      "bin": {
+        "tsc-watch": "dist/lib/tsc-watch.js"
+      },
+      "engines": {
+        "node": ">=12.12.0"
+      },
+      "peerDependencies": {
+        "typescript": "*"
+      }
+    },
+    "node_modules/typescript": {
+      "version": "5.2.2",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-5.2.2.tgz",
+      "integrity": "sha512-mI4WrpHsbCIcwT9cF4FZvr80QUeKvsUsUvKDoR+X/7XHQH98xYD8YHZg7ANtz2GtZt/CBq2QJ0thkGJMHfqc1w==",
+      "dev": true,
+      "bin": {
+        "tsc": "bin/tsc",
+        "tsserver": "bin/tsserver"
+      },
+      "engines": {
+        "node": ">=14.17"
+      }
+    },
+    "node_modules/which": {
+      "version": "2.0.2",
+      "resolved": "https://registry.npmjs.org/which/-/which-2.0.2.tgz",
+      "integrity": "sha512-BLI3Tl1TW3Pvl70l3yq3Y64i+awpwXqsGBYWkkqMtnbXgrMD+yj7rhW0kuEDxzJaYXGjEW5ogapKNMEKNMjibA==",
+      "dev": true,
+      "dependencies": {
+        "isexe": "^2.0.0"
+      },
+      "bin": {
+        "node-which": "bin/node-which"
+      },
+      "engines": {
+        "node": ">= 8"
+      }
+    }
+  }
+}
--- a/Chapter/webapp/package.json
+++ b/Chapter/webapp/package.json
@ -0,0 +1,20 @@
+{
+  "name": "webapp",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "start": "tsc-watch --onsuccess \"node dist/server.js\""
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "devDependencies": {
+    "@tsconfig/node20": "^20.1.2",
+    "tsc-watch": "^6.0.4",
+    "typescript": "^5.2.2"
+  },
+  "dependencies": {
+    "@types/node": "^20.6.1"
+  }
+}
--- a/Chapter/webapp/src/count_promise.ts
+++ b/Chapter/webapp/src/count_promise.ts
@ -0,0 +1,29 @@
+import { Worker } from "worker_threads";
+
+export const Count = (request: number, 
+        iterations: number, total: number) : Promise<void> => {
+
+    return new Promise<void>((resolve, reject) => {
+
+        const worker = new Worker(__dirname + "/count_worker.js", {
+            workerData: {
+                iterations, total, request
+            }
+        });
+
+        worker.on("message", (iter) => {
+            const msg = `Request: ${request}, Iteration: ${(iter)}`;            
+            console.log(msg);            
+        }); 
+
+       worker.on("exit", (code) => {
+            if (code !== 0) {
+                reject();
+            } else {
+                resolve();
+            }
+        });
+        
+       worker.on("error", reject);        
+    });
+}
--- a/Chapter/webapp/src/count_worker.ts
+++ b/Chapter/webapp/src/count_worker.ts
@ -0,0 +1,12 @@
+import { workerData, parentPort  } from "worker_threads";
+
+console.log(`Worker thread ${workerData.request} started`);
+
+for (let iter = 0; iter < workerData.iterations; iter++) {
+    for (let count = 0; count < workerData.total; count++) {
+        count++;
+    }
+    parentPort?.postMessage(iter);
+}
+
+console.log(`Worker thread ${workerData.request} finished`);
--- a/Chapter/webapp/src/counter_cb.ts
+++ b/Chapter/webapp/src/counter_cb.ts
@ -0,0 +1,25 @@
+import { Worker } from "worker_threads";
+
+export const Count = (request: number, iterations: number, total: number, 
+        callback: (err: Error | null, update: number | boolean) => void) => {
+
+    const worker = new Worker(__dirname + "/count_worker.js", {
+        workerData: {
+            iterations, 
+            total, 
+            request
+        }
+    });
+    
+    worker.on("message", async (iter: number) => {
+        callback(null, iter);
+    });
+    
+    worker.on("exit", async (code: number) => {
+        callback(code === 0 ? null : new Error(), true);
+    });
+    
+    worker.on("error", async (err) => {
+        callback(err, true);
+    });        
+}
--- a/Chapter/webapp/src/handler.ts
+++ b/Chapter/webapp/src/handler.ts
@ -0,0 +1,23 @@
+import { IncomingMessage, ServerResponse } from "http";
+import { endPromise, writePromise } from "./promises";
+//import { Count } from "./counter_cb";
+import { Count } from "./count_promise";
+
+const total = 2_000_000_000;
+const iterations = 15;
+let shared_counter = 0;
+
+export const handler = async (req: IncomingMessage, res: ServerResponse) => {
+    const request = shared_counter++;
+
+    try {
+        await Count(request, iterations, total);
+        const msg = `Request: ${request}, Iterations: ${(iterations)}`;        
+        await writePromise.bind(res)(msg + "\n");                   
+        await endPromise.bind(res)("Done");        
+    } catch (err: any) {
+        console.log(err);
+        res.statusCode = 500;
+        res.end();
+    }
+};
--- a/Chapter/webapp/src/promises.ts
+++ b/Chapter/webapp/src/promises.ts
@ -0,0 +1,8 @@
+import { ServerResponse } from "http";
+import { promisify } from "util";
+
+export const endPromise = promisify(ServerResponse.prototype.end) as 
+    (data: any) => Promise<void>;
+
+export const writePromise = promisify(ServerResponse.prototype.write) as
+    (data: any) => Promise<void>;
--- a/Chapter/webapp/src/server.ts
+++ b/Chapter/webapp/src/server.ts
@ -0,0 +1,21 @@
+import { createServer } from "http";
+import { handler } from "./handler";
+
+const port = 5000;
+
+const server = createServer();
+
+server.on("request", (req, res) => {
+    if (req.url?.endsWith("favicon.ico")) {
+        res.statusCode = 404;
+        res.end();
+    } else {
+        handler(req, res)
+    }
+});
+
+server.listen(port);
+
+server.on("listening", () => {
+    console.log(`(Event) Server listening on port ${port}`);
+});
--- a/Chapter/webapp/tsconfig.json
+++ b/Chapter/webapp/tsconfig.json
@ -0,0 +1,8 @@
+{
+    "extends": "@tsconfig/node20/tsconfig.json",
+     "compilerOptions": {                       
+         "rootDir": "src",   
+         "outDir": "dist",                                    
+     }
+ }
+ 
--- a/Chapter/webapp/cert.pem
+++ b/Chapter/webapp/cert.pem
@ -0,0 +1,31 @@
+-----BEGIN CERTIFICATE-----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=
+-----END CERTIFICATE-----
--- a/Chapter/webapp/data.json
+++ b/Chapter/webapp/data.json
@ -0,0 +1,14 @@
+{
+    "products": [
+        { "id": 1, "name": "Kayak", "category": "Watersports", 
+            "description": "A boat for one person", "price": 275 },
+        { "id": 2, "name": "Lifejacket", "category": "Watersports", 
+            "description": "Protective and fashionable", "price": 48.95 },
+        { "id": 3, "name": "Soccer Ball", "category": "Soccer", 
+            "description": "FIFA-approved size and weight", 
+            "price": 19.50 },
+        { "id": 4, "name": "Corner Flags", "category": "Soccer", 
+            "description": "Give your playing field a professional touch", 
+            "price": 34.95 }
+    ]
+}
--- a/Chapter/webapp/dist/count_promise.js
+++ b/Chapter/webapp/dist/count_promise.js
@ -0,0 +1,27 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.Count = void 0;
+const worker_threads_1 = require("worker_threads");
+const Count = (request, iterations, total) => {
+    return new Promise((resolve, reject) => {
+        const worker = new worker_threads_1.Worker(__dirname + "/count_worker.js", {
+            workerData: {
+                iterations, total, request
+            }
+        });
+        worker.on("message", (iter) => {
+            const msg = `Request: ${request}, Iteration: ${(iter)}`;
+            console.log(msg);
+        });
+        worker.on("exit", (code) => {
+            if (code !== 0) {
+                reject();
+            }
+            else {
+                resolve();
+            }
+        });
+        worker.on("error", reject);
+    });
+};
+exports.Count = Count;
--- a/Chapter/webapp/dist/count_worker.js
+++ b/Chapter/webapp/dist/count_worker.js
@ -0,0 +1,11 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+const worker_threads_1 = require("worker_threads");
+console.log(`Worker thread ${worker_threads_1.workerData.request} started`);
+for (let iter = 0; iter < worker_threads_1.workerData.iterations; iter++) {
+    for (let count = 0; count < worker_threads_1.workerData.total; count++) {
+        count++;
+    }
+    worker_threads_1.parentPort?.postMessage(iter);
+}
+console.log(`Worker thread ${worker_threads_1.workerData.request} finished`);
--- a/Chapter/webapp/dist/counter_cb.js
+++ b/Chapter/webapp/dist/counter_cb.js
@ -0,0 +1,23 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.Count = void 0;
+const worker_threads_1 = require("worker_threads");
+const Count = (request, iterations, total, callback) => {
+    const worker = new worker_threads_1.Worker(__dirname + "/count_worker.js", {
+        workerData: {
+            iterations,
+            total,
+            request
+        }
+    });
+    worker.on("message", async (iter) => {
+        callback(null, iter);
+    });
+    worker.on("exit", async (code) => {
+        callback(code === 0 ? null : new Error(), true);
+    });
+    worker.on("error", async (err) => {
+        callback(err, true);
+    });
+};
+exports.Count = Count;
--- a/Chapter/webapp/dist/handler.js
+++ b/Chapter/webapp/dist/handler.js
@ -0,0 +1,28 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.defaultHandler = exports.newUrlHandler = exports.notFoundHandler = exports.redirectionHandler = void 0;
+const redirectionHandler = (req, resp) => {
+    resp.writeHead(302, {
+        "Location": "https://localhost:5500"
+    });
+    resp.end();
+};
+exports.redirectionHandler = redirectionHandler;
+const notFoundHandler = (req, resp) => {
+    resp.sendStatus(404);
+};
+exports.notFoundHandler = notFoundHandler;
+const newUrlHandler = (req, resp) => {
+    const msg = req.params.message ?? "(No Message)";
+    resp.send(`Hello, ${msg}`);
+};
+exports.newUrlHandler = newUrlHandler;
+const defaultHandler = (req, resp) => {
+    if (req.query.keyword) {
+        resp.send(`Hello, ${req.query.keyword}`);
+    }
+    else {
+        resp.send(`Hello, ${req.protocol.toUpperCase()}`);
+    }
+};
+exports.defaultHandler = defaultHandler;
--- a/Chapter/webapp/dist/promises.js
+++ b/Chapter/webapp/dist/promises.js
@ -0,0 +1,7 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.writePromise = exports.endPromise = void 0;
+const http_1 = require("http");
+const util_1 = require("util");
+exports.endPromise = (0, util_1.promisify)(http_1.ServerResponse.prototype.end);
+exports.writePromise = (0, util_1.promisify)(http_1.ServerResponse.prototype.write);
--- a/Chapter/webapp/dist/server.js
+++ b/Chapter/webapp/dist/server.js
@ -0,0 +1,24 @@
+"use strict";
+var __importDefault = (this && this.__importDefault) || function (mod) {
+    return (mod && mod.__esModule) ? mod : { "default": mod };
+};
+Object.defineProperty(exports, "__esModule", { value: true });
+const http_1 = require("http");
+const handler_1 = require("./handler");
+const https_1 = require("https");
+const fs_1 = require("fs");
+const express_1 = __importDefault(require("express"));
+const port = 5000;
+const https_port = 5500;
+const server = (0, http_1.createServer)(handler_1.redirectionHandler);
+server.listen(port, () => console.log(`(Event) Server listening on port ${port}`));
+const httpsConfig = {
+    key: (0, fs_1.readFileSync)("key.pem"),
+    cert: (0, fs_1.readFileSync)("cert.pem")
+};
+const expressApp = (0, express_1.default)();
+expressApp.get("/favicon.ico", handler_1.notFoundHandler);
+expressApp.get("/newurl/:message?", handler_1.newUrlHandler);
+expressApp.get("*", handler_1.defaultHandler);
+const httpsServer = (0, https_1.createServer)(httpsConfig, expressApp);
+httpsServer.listen(https_port, () => console.log(`HTTPS Server listening on port ${https_port}`));
--- a/Chapter/webapp/key.pem
+++ b/Chapter/webapp/key.pem
@ -0,0 +1,52 @@
+-----BEGIN PRIVATE KEY-----
+MIIJQgIBADANBgkqhkiG9w0BAQEFAASCCSwwggkoAgEAAoICAQCtaoUVxPOhkOPp
+zCCcE/KDyCOSiBvDwpV7iokfIaavik0R6CixgYKvz8IBpy9C7gYNnSvoCeNl/YKn
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+tqasx4kz/e52D4vKapVuohpQ7mYfOg==
+-----END PRIVATE KEY-----
--- a/Chapter/webapp/package-lock.json
+++ b/Chapter/webapp/package-lock.json
@ -0,0 +1,961 @@
+{
+  "name": "webapp",
+  "version": "1.0.0",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "webapp",
+      "version": "1.0.0",
+      "license": "ISC",
+      "dependencies": {
+        "@types/node": "^20.6.1",
+        "express": "^4.18.2"
+      },
+      "devDependencies": {
+        "@tsconfig/node20": "^20.1.2",
+        "@types/express": "^4.17.20",
+        "tsc-watch": "^6.0.4",
+        "typescript": "^5.2.2"
+      }
+    },
+    "node_modules/@tsconfig/node20": {
+      "version": "20.1.2",
+      "resolved": "https://registry.npmjs.org/@tsconfig/node20/-/node20-20.1.2.tgz",
+      "integrity": "sha512-madaWq2k+LYMEhmcp0fs+OGaLFk0OenpHa4gmI4VEmCKX4PJntQ6fnnGADVFrVkBj0wIdAlQnK/MrlYTHsa1gQ==",
+      "dev": true
+    },
+    "node_modules/@types/body-parser": {
+      "version": "1.19.4",
+      "resolved": "https://registry.npmjs.org/@types/body-parser/-/body-parser-1.19.4.tgz",
+      "integrity": "sha512-N7UDG0/xiPQa2D/XrVJXjkWbpqHCd2sBaB32ggRF2l83RhPfamgKGF8gwwqyksS95qUS5ZYF9aF+lLPRlwI2UA==",
+      "dev": true,
+      "dependencies": {
+        "@types/connect": "*",
+        "@types/node": "*"
+      }
+    },
+    "node_modules/@types/connect": {
+      "version": "3.4.37",
+      "resolved": "https://registry.npmjs.org/@types/connect/-/connect-3.4.37.tgz",
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+      "dev": true,
+      "dependencies": {
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+      }
+    },
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+        "@types/qs": "*",
+        "@types/serve-static": "*"
+      }
+    },
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+        },
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+    },
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+        "encodeurl": "~1.0.2",
+        "escape-html": "~1.0.3",
+        "parseurl": "~1.3.3",
+        "send": "0.18.0"
+      },
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+        "get-intrinsic": "^1.2.1",
+        "gopd": "^1.0.1",
+        "has-property-descriptors": "^1.0.0"
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+      },
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+      }
+    },
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+      "dev": true,
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/side-channel": {
+      "version": "1.0.4",
+      "resolved": "https://registry.npmjs.org/side-channel/-/side-channel-1.0.4.tgz",
+      "integrity": "sha512-q5XPytqFEIKHkGdiMIrY10mvLRvnQh42/+GoBlFW3b2LXLE2xxJpZFdm94we0BaoV3RwJyGqg5wS7epxTv0Zvw==",
+      "dependencies": {
+        "call-bind": "^1.0.0",
+        "get-intrinsic": "^1.0.2",
+        "object-inspect": "^1.9.0"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/ljharb"
+      }
+    },
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+      "dependencies": {
+        "through": "2"
+      },
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+      }
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+      "dev": true,
+      "dependencies": {
+        "duplexer": "~0.1.1"
+      }
+    },
+    "node_modules/string-argv": {
+      "version": "0.3.2",
+      "resolved": "https://registry.npmjs.org/string-argv/-/string-argv-0.3.2.tgz",
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+    },
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+        "node-cleanup": "^2.1.2",
+        "ps-tree": "^1.2.0",
+        "string-argv": "^0.3.1"
+      },
+      "bin": {
+        "tsc-watch": "dist/lib/tsc-watch.js"
+      },
+      "engines": {
+        "node": ">=12.12.0"
+      },
+      "peerDependencies": {
+        "typescript": "*"
+      }
+    },
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+        "media-typer": "0.3.0",
+        "mime-types": "~2.1.24"
+      },
+      "engines": {
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+      }
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+      "dev": true,
+      "bin": {
+        "tsc": "bin/tsc",
+        "tsserver": "bin/tsserver"
+      },
+      "engines": {
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+      }
+    },
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+      "engines": {
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+    "node_modules/utils-merge": {
+      "version": "1.0.1",
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+      "engines": {
+        "node": ">= 0.4.0"
+      }
+    },
+    "node_modules/vary": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/vary/-/vary-1.1.2.tgz",
+      "integrity": "sha512-BNGbWLfd0eUPabhkXUVm0j8uuvREyTh5ovRa/dyow/BqAbZJyC+5fU+IzQOzmAKzYqYRAISoRhdQr3eIZ/PXqg==",
+      "engines": {
+        "node": ">= 0.8"
+      }
+    },
+    "node_modules/which": {
+      "version": "2.0.2",
+      "resolved": "https://registry.npmjs.org/which/-/which-2.0.2.tgz",
+      "integrity": "sha512-BLI3Tl1TW3Pvl70l3yq3Y64i+awpwXqsGBYWkkqMtnbXgrMD+yj7rhW0kuEDxzJaYXGjEW5ogapKNMEKNMjibA==",
+      "dev": true,
+      "dependencies": {
+        "isexe": "^2.0.0"
+      },
+      "bin": {
+        "node-which": "bin/node-which"
+      },
+      "engines": {
+        "node": ">= 8"
+      }
+    }
+  }
+}
--- a/Chapter/webapp/package.json
+++ b/Chapter/webapp/package.json
@ -0,0 +1,22 @@
+{
+  "name": "webapp",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "start": "tsc-watch --onsuccess \"node dist/server.js\""
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "devDependencies": {
+    "@tsconfig/node20": "^20.1.2",
+    "@types/express": "^4.17.20",
+    "tsc-watch": "^6.0.4",
+    "typescript": "^5.2.2"
+  },
+  "dependencies": {
+    "@types/node": "^20.6.1",
+    "express": "^4.18.2"
+  }
+}
--- a/Chapter/webapp/src/count_promise.ts
+++ b/Chapter/webapp/src/count_promise.ts
@ -0,0 +1,29 @@
+import { Worker } from "worker_threads";
+
+export const Count = (request: number, 
+        iterations: number, total: number) : Promise<void> => {
+
+    return new Promise<void>((resolve, reject) => {
+
+        const worker = new Worker(__dirname + "/count_worker.js", {
+            workerData: {
+                iterations, total, request
+            }
+        });
+
+        worker.on("message", (iter) => {
+            const msg = `Request: ${request}, Iteration: ${(iter)}`;            
+            console.log(msg);            
+        }); 
+
+       worker.on("exit", (code) => {
+            if (code !== 0) {
+                reject();
+            } else {
+                resolve();
+            }
+        });
+        
+       worker.on("error", reject);        
+    });
+}
--- a/Chapter/webapp/src/count_worker.ts
+++ b/Chapter/webapp/src/count_worker.ts
@ -0,0 +1,12 @@
+import { workerData, parentPort  } from "worker_threads";
+
+console.log(`Worker thread ${workerData.request} started`);
+
+for (let iter = 0; iter < workerData.iterations; iter++) {
+    for (let count = 0; count < workerData.total; count++) {
+        count++;
+    }
+    parentPort?.postMessage(iter);
+}
+
+console.log(`Worker thread ${workerData.request} finished`);
--- a/Chapter/webapp/src/counter_cb.ts
+++ b/Chapter/webapp/src/counter_cb.ts
@ -0,0 +1,25 @@
+import { Worker } from "worker_threads";
+
+export const Count = (request: number, iterations: number, total: number, 
+        callback: (err: Error | null, update: number | boolean) => void) => {
+
+    const worker = new Worker(__dirname + "/count_worker.js", {
+        workerData: {
+            iterations, 
+            total, 
+            request
+        }
+    });
+    
+    worker.on("message", async (iter: number) => {
+        callback(null, iter);
+    });
+    
+    worker.on("exit", async (code: number) => {
+        callback(code === 0 ? null : new Error(), true);
+    });
+    
+    worker.on("error", async (err) => {
+        callback(err, true);
+    });        
+}
--- a/Chapter/webapp/src/handler.ts
+++ b/Chapter/webapp/src/handler.ts
@ -0,0 +1,26 @@
+import { IncomingMessage, ServerResponse } from "http";
+import { Request, Response } from "express";
+
+export const redirectionHandler = (req: IncomingMessage, resp: ServerResponse) => {
+    resp.writeHead(302, {
+        "Location": "https://localhost:5500"
+    });
+    resp.end();
+}
+
+export const notFoundHandler = (req: Request, resp: Response) => {
+    resp.sendStatus(404);
+}
+
+export const newUrlHandler = (req: Request, resp: Response) => {
+    const msg = req.params.message ?? "(No Message)";
+    resp.send(`Hello, ${msg}`);
+}
+
+export const defaultHandler = (req: Request, resp: Response) => {
+    if (req.query.keyword) {
+        resp.send(`Hello, ${req.query.keyword}`);                    
+    } else {
+        resp.send(`Hello, ${req.protocol.toUpperCase()}`);
+    }
+}
--- a/Chapter/webapp/src/promises.ts
+++ b/Chapter/webapp/src/promises.ts
@ -0,0 +1,8 @@
+import { ServerResponse } from "http";
+import { promisify } from "util";
+
+export const endPromise = promisify(ServerResponse.prototype.end) as 
+    (data: any) => Promise<void>;
+
+export const writePromise = promisify(ServerResponse.prototype.write) as
+    (data: any) => Promise<void>;
--- a/Chapter/webapp/src/server.ts
+++ b/Chapter/webapp/src/server.ts
@ -0,0 +1,29 @@
+import { createServer } from "http";
+import { redirectionHandler, newUrlHandler, defaultHandler, 
+            notFoundHandler } from "./handler";
+import { createServer as createHttpsServer } from "https";
+import { readFileSync } from "fs";
+import express, { Express } from "express";
+
+const port = 5000;
+const https_port = 5500;
+
+const server = createServer(redirectionHandler);
+
+server.listen(port, 
+    () => console.log(`(Event) Server listening on port ${port}`));
+
+const httpsConfig = {
+    key: readFileSync("key.pem"), 
+    cert: readFileSync("cert.pem")
+};    
+
+const expressApp: Express = express();
+expressApp.get("/favicon.ico", notFoundHandler);
+expressApp.get("/newurl/:message?", newUrlHandler);
+expressApp.get("*", defaultHandler);
+
+const httpsServer = createHttpsServer(httpsConfig, expressApp);
+
+httpsServer.listen(https_port, 
+    () => console.log(`HTTPS Server listening on port ${https_port}`));
--- a/Chapter/webapp/tsconfig.json
+++ b/Chapter/webapp/tsconfig.json
@ -0,0 +1,8 @@
+{
+    "extends": "@tsconfig/node20/tsconfig.json",
+     "compilerOptions": {                       
+         "rootDir": "src",   
+         "outDir": "dist",                                    
+     }
+ }
+ 
--- a/Chapter/webapp/cert.pem
+++ b/Chapter/webapp/cert.pem
@ -0,0 +1,31 @@
+-----BEGIN CERTIFICATE-----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+zQcer5Zi+PetlUDE0nw7BcR4tuD6RosPFOIT6anqdkwRBs97M5C9ELNFH4z/Bhw=
+-----END CERTIFICATE-----
--- a/Chapter/webapp/data.json
+++ b/Chapter/webapp/data.json
@ -0,0 +1,14 @@
+{
+    "products": [
+        { "id": 1, "name": "Kayak", "category": "Watersports", 
+            "description": "A boat for one person", "price": 275 },
+        { "id": 2, "name": "Lifejacket", "category": "Watersports", 
+            "description": "Protective and fashionable", "price": 48.95 },
+        { "id": 3, "name": "Soccer Ball", "category": "Soccer", 
+            "description": "FIFA-approved size and weight", 
+            "price": 19.50 },
+        { "id": 4, "name": "Corner Flags", "category": "Soccer", 
+            "description": "Give your playing field a professional touch", 
+            "price": 34.95 }
+    ]
+}
--- a/Chapter/webapp/dist/count_promise.js
+++ b/Chapter/webapp/dist/count_promise.js
@ -0,0 +1,27 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.Count = void 0;
+const worker_threads_1 = require("worker_threads");
+const Count = (request, iterations, total) => {
+    return new Promise((resolve, reject) => {
+        const worker = new worker_threads_1.Worker(__dirname + "/count_worker.js", {
+            workerData: {
+                iterations, total, request
+            }
+        });
+        worker.on("message", (iter) => {
+            const msg = `Request: ${request}, Iteration: ${(iter)}`;
+            console.log(msg);
+        });
+        worker.on("exit", (code) => {
+            if (code !== 0) {
+                reject();
+            }
+            else {
+                resolve();
+            }
+        });
+        worker.on("error", reject);
+    });
+};
+exports.Count = Count;
--- a/Chapter/webapp/dist/count_worker.js
+++ b/Chapter/webapp/dist/count_worker.js
@ -0,0 +1,11 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+const worker_threads_1 = require("worker_threads");
+console.log(`Worker thread ${worker_threads_1.workerData.request} started`);
+for (let iter = 0; iter < worker_threads_1.workerData.iterations; iter++) {
+    for (let count = 0; count < worker_threads_1.workerData.total; count++) {
+        count++;
+    }
+    worker_threads_1.parentPort?.postMessage(iter);
+}
+console.log(`Worker thread ${worker_threads_1.workerData.request} finished`);
--- a/Chapter/webapp/dist/counter_cb.js
+++ b/Chapter/webapp/dist/counter_cb.js
@ -0,0 +1,23 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.Count = void 0;
+const worker_threads_1 = require("worker_threads");
+const Count = (request, iterations, total, callback) => {
+    const worker = new worker_threads_1.Worker(__dirname + "/count_worker.js", {
+        workerData: {
+            iterations,
+            total,
+            request
+        }
+    });
+    worker.on("message", async (iter) => {
+        callback(null, iter);
+    });
+    worker.on("exit", async (code) => {
+        callback(code === 0 ? null : new Error(), true);
+    });
+    worker.on("error", async (err) => {
+        callback(err, true);
+    });
+};
+exports.Count = Count;
--- a/Chapter/webapp/dist/handler.js
+++ b/Chapter/webapp/dist/handler.js
@ -0,0 +1,28 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.defaultHandler = exports.newUrlHandler = exports.notFoundHandler = exports.redirectionHandler = void 0;
+const redirectionHandler = (req, resp) => {
+    resp.writeHead(302, {
+        "Location": "https://localhost:5500"
+    });
+    resp.end();
+};
+exports.redirectionHandler = redirectionHandler;
+const notFoundHandler = (req, resp) => {
+    resp.sendStatus(404);
+};
+exports.notFoundHandler = notFoundHandler;
+const newUrlHandler = (req, resp) => {
+    const msg = req.params.message ?? "(No Message)";
+    resp.send(`Hello, ${msg}`);
+};
+exports.newUrlHandler = newUrlHandler;
+const defaultHandler = (req, resp) => {
+    if (req.query.keyword) {
+        resp.send(`Hello, ${req.query.keyword}`);
+    }
+    else {
+        resp.send(`Hello, ${req.protocol.toUpperCase()}`);
+    }
+};
+exports.defaultHandler = defaultHandler;
--- a/Chapter/webapp/dist/promises.js
+++ b/Chapter/webapp/dist/promises.js
@ -0,0 +1,7 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.writePromise = exports.endPromise = void 0;
+const http_1 = require("http");
+const util_1 = require("util");
+exports.endPromise = (0, util_1.promisify)(http_1.ServerResponse.prototype.end);
+exports.writePromise = (0, util_1.promisify)(http_1.ServerResponse.prototype.write);
--- a/Chapter/webapp/dist/server.js
+++ b/Chapter/webapp/dist/server.js
@ -0,0 +1,24 @@
+"use strict";
+var __importDefault = (this && this.__importDefault) || function (mod) {
+    return (mod && mod.__esModule) ? mod : { "default": mod };
+};
+Object.defineProperty(exports, "__esModule", { value: true });
+const http_1 = require("http");
+const handler_1 = require("./handler");
+const https_1 = require("https");
+const fs_1 = require("fs");
+const express_1 = __importDefault(require("express"));
+const port = 5000;
+const https_port = 5500;
+const server = (0, http_1.createServer)(handler_1.redirectionHandler);
+server.listen(port, () => console.log(`(Event) Server listening on port ${port}`));
+const httpsConfig = {
+    key: (0, fs_1.readFileSync)("key.pem"),
+    cert: (0, fs_1.readFileSync)("cert.pem")
+};
+const expressApp = (0, express_1.default)();
+expressApp.get("/favicon.ico", handler_1.notFoundHandler);
+expressApp.get("/newurl/:message?", handler_1.newUrlHandler);
+expressApp.get("*", handler_1.defaultHandler);
+const httpsServer = (0, https_1.createServer)(httpsConfig, expressApp);
+httpsServer.listen(https_port, () => console.log(`HTTPS Server listening on port ${https_port}`));
--- a/Chapter/webapp/key.pem
+++ b/Chapter/webapp/key.pem
@ -0,0 +1,52 @@
+-----BEGIN PRIVATE KEY-----
+MIIJQgIBADANBgkqhkiG9w0BAQEFAASCCSwwggkoAgEAAoICAQCtaoUVxPOhkOPp
+zCCcE/KDyCOSiBvDwpV7iokfIaavik0R6CixgYKvz8IBpy9C7gYNnSvoCeNl/YKn
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+tqasx4kz/e52D4vKapVuohpQ7mYfOg==
+-----END PRIVATE KEY-----
--- a/Chapter/webapp/package-lock.json
+++ b/Chapter/webapp/package-lock.json
@ -0,0 +1,961 @@
+{
+  "name": "webapp",
+  "version": "1.0.0",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "webapp",
+      "version": "1.0.0",
+      "license": "ISC",
+      "dependencies": {
+        "@types/node": "^20.6.1",
+        "express": "^4.18.2"
+      },
+      "devDependencies": {
+        "@tsconfig/node20": "^20.1.2",
+        "@types/express": "^4.17.20",
+        "tsc-watch": "^6.0.4",
+        "typescript": "^5.2.2"
+      }
+    },
+    "node_modules/@tsconfig/node20": {
+      "version": "20.1.2",
+      "resolved": "https://registry.npmjs.org/@tsconfig/node20/-/node20-20.1.2.tgz",
+      "integrity": "sha512-madaWq2k+LYMEhmcp0fs+OGaLFk0OenpHa4gmI4VEmCKX4PJntQ6fnnGADVFrVkBj0wIdAlQnK/MrlYTHsa1gQ==",
+      "dev": true
+    },
+    "node_modules/@types/body-parser": {
+      "version": "1.19.4",
+      "resolved": "https://registry.npmjs.org/@types/body-parser/-/body-parser-1.19.4.tgz",
+      "integrity": "sha512-N7UDG0/xiPQa2D/XrVJXjkWbpqHCd2sBaB32ggRF2l83RhPfamgKGF8gwwqyksS95qUS5ZYF9aF+lLPRlwI2UA==",
+      "dev": true,
+      "dependencies": {
+        "@types/connect": "*",
+        "@types/node": "*"
+      }
+    },
+    "node_modules/@types/connect": {
+      "version": "3.4.37",
+      "resolved": "https://registry.npmjs.org/@types/connect/-/connect-3.4.37.tgz",
+      "integrity": "sha512-zBUSRqkfZ59OcwXon4HVxhx5oWCJmc0OtBTK05M+p0dYjgN6iTwIL2T/WbsQZrEsdnwaF9cWQ+azOnpPvIqY3Q==",
+      "dev": true,
+      "dependencies": {
+        "@types/node": "*"
+      }
+    },
+    "node_modules/@types/express": {
+      "version": "4.17.20",
+      "resolved": "https://registry.npmjs.org/@types/express/-/express-4.17.20.tgz",
+      "integrity": "sha512-rOaqlkgEvOW495xErXMsmyX3WKBInbhG5eqojXYi3cGUaLoRDlXa5d52fkfWZT963AZ3v2eZ4MbKE6WpDAGVsw==",
+      "dev": true,
+      "dependencies": {
+        "@types/body-parser": "*",
+        "@types/express-serve-static-core": "^4.17.33",
+        "@types/qs": "*",
+        "@types/serve-static": "*"
+      }
+    },
+    "node_modules/@types/express-serve-static-core": {
+      "version": "4.17.39",
+      "resolved": "https://registry.npmjs.org/@types/express-serve-static-core/-/express-serve-static-core-4.17.39.tgz",
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+      "dev": true,
+      "dependencies": {
+        "@types/node": "*",
+        "@types/qs": "*",
+        "@types/range-parser": "*",
+        "@types/send": "*"
+      }
+    },
+    "node_modules/@types/http-errors": {
+      "version": "2.0.3",
+      "resolved": "https://registry.npmjs.org/@types/http-errors/-/http-errors-2.0.3.tgz",
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+      "dev": true
+    },
+    "node_modules/@types/mime": {
+      "version": "1.3.4",
+      "resolved": "https://registry.npmjs.org/@types/mime/-/mime-1.3.4.tgz",
+      "integrity": "sha512-1Gjee59G25MrQGk8bsNvC6fxNiRgUlGn2wlhGf95a59DrprnnHk80FIMMFG9XHMdrfsuA119ht06QPDXA1Z7tw==",
+      "dev": true
+    },
+    "node_modules/@types/node": {
+      "version": "20.6.1",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-20.6.1.tgz",
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+    },
+    "node_modules/@types/qs": {
+      "version": "6.9.9",
+      "resolved": "https://registry.npmjs.org/@types/qs/-/qs-6.9.9.tgz",
+      "integrity": "sha512-wYLxw35euwqGvTDx6zfY1vokBFnsK0HNrzc6xNHchxfO2hpuRg74GbkEW7e3sSmPvj0TjCDT1VCa6OtHXnubsg==",
+      "dev": true
+    },
+    "node_modules/@types/range-parser": {
+      "version": "1.2.6",
+      "resolved": "https://registry.npmjs.org/@types/range-parser/-/range-parser-1.2.6.tgz",
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+      "dev": true
+    },
+    "node_modules/@types/send": {
+      "version": "0.17.3",
+      "resolved": "https://registry.npmjs.org/@types/send/-/send-0.17.3.tgz",
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+      "dev": true,
+      "dependencies": {
+        "@types/mime": "^1",
+        "@types/node": "*"
+      }
+    },
+    "node_modules/@types/serve-static": {
+      "version": "1.15.4",
+      "resolved": "https://registry.npmjs.org/@types/serve-static/-/serve-static-1.15.4.tgz",
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+      "dev": true,
+      "dependencies": {
+        "@types/http-errors": "*",
+        "@types/mime": "*",
+        "@types/node": "*"
+      }
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--- a/Chapter/webapp/package.json
+++ b/Chapter/webapp/package.json
@ -0,0 +1,22 @@
+{
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+  "main": "index.js",
+  "scripts": {
+    "start": "tsc-watch --onsuccess \"node dist/server.js\""
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "devDependencies": {
+    "@tsconfig/node20": "^20.1.2",
+    "@types/express": "^4.17.20",
+    "tsc-watch": "^6.0.4",
+    "typescript": "^5.2.2"
+  },
+  "dependencies": {
+    "@types/node": "^20.6.1",
+    "express": "^4.18.2"
+  }
+}
--- a/Chapter/webapp/src/count_promise.ts
+++ b/Chapter/webapp/src/count_promise.ts
@ -0,0 +1,29 @@
+import { Worker } from "worker_threads";
+
+export const Count = (request: number, 
+        iterations: number, total: number) : Promise<void> => {
+
+    return new Promise<void>((resolve, reject) => {
+
+        const worker = new Worker(__dirname + "/count_worker.js", {
+            workerData: {
+                iterations, total, request
+            }
+        });
+
+        worker.on("message", (iter) => {
+            const msg = `Request: ${request}, Iteration: ${(iter)}`;            
+            console.log(msg);            
+        }); 
+
+       worker.on("exit", (code) => {
+            if (code !== 0) {
+                reject();
+            } else {
+                resolve();
+            }
+        });
+        
+       worker.on("error", reject);        
+    });
+}
--- a/Chapter/webapp/src/count_worker.ts
+++ b/Chapter/webapp/src/count_worker.ts
@ -0,0 +1,12 @@
+import { workerData, parentPort  } from "worker_threads";
+
+console.log(`Worker thread ${workerData.request} started`);
+
+for (let iter = 0; iter < workerData.iterations; iter++) {
+    for (let count = 0; count < workerData.total; count++) {
+        count++;
+    }
+    parentPort?.postMessage(iter);
+}
+
+console.log(`Worker thread ${workerData.request} finished`);
--- a/Chapter/webapp/src/counter_cb.ts
+++ b/Chapter/webapp/src/counter_cb.ts
@ -0,0 +1,25 @@
+import { Worker } from "worker_threads";
+
+export const Count = (request: number, iterations: number, total: number, 
+        callback: (err: Error | null, update: number | boolean) => void) => {
+
+    const worker = new Worker(__dirname + "/count_worker.js", {
+        workerData: {
+            iterations, 
+            total, 
+            request
+        }
+    });
+    
+    worker.on("message", async (iter: number) => {
+        callback(null, iter);
+    });
+    
+    worker.on("exit", async (code: number) => {
+        callback(code === 0 ? null : new Error(), true);
+    });
+    
+    worker.on("error", async (err) => {
+        callback(err, true);
+    });        
+}
--- a/Chapter/webapp/src/handler.ts
+++ b/Chapter/webapp/src/handler.ts
@ -0,0 +1,26 @@
+import { IncomingMessage, ServerResponse } from "http";
+import { Request, Response } from "express";
+
+export const redirectionHandler = (req: IncomingMessage, resp: ServerResponse) => {
+    resp.writeHead(302, {
+        "Location": "https://localhost:5500"
+    });
+    resp.end();
+}
+
+export const notFoundHandler = (req: Request, resp: Response) => {
+    resp.sendStatus(404);
+}
+
+export const newUrlHandler = (req: Request, resp: Response) => {
+    const msg = req.params.message ?? "(No Message)";
+    resp.send(`Hello, ${msg}`);
+}
+
+export const defaultHandler = (req: Request, resp: Response) => {
+    if (req.query.keyword) {
+        resp.send(`Hello, ${req.query.keyword}`);                    
+    } else {
+        resp.send(`Hello, ${req.protocol.toUpperCase()}`);
+    }
+}
--- a/Chapter/webapp/src/promises.ts
+++ b/Chapter/webapp/src/promises.ts
@ -0,0 +1,8 @@
+import { ServerResponse } from "http";
+import { promisify } from "util";
+
+export const endPromise = promisify(ServerResponse.prototype.end) as 
+    (data: any) => Promise<void>;
+
+export const writePromise = promisify(ServerResponse.prototype.write) as
+    (data: any) => Promise<void>;
--- a/Chapter/webapp/src/server.ts
+++ b/Chapter/webapp/src/server.ts
@ -0,0 +1,29 @@
+import { createServer } from "http";
+import { redirectionHandler, newUrlHandler, defaultHandler, 
+            notFoundHandler } from "./handler";
+import { createServer as createHttpsServer } from "https";
+import { readFileSync } from "fs";
+import express, { Express } from "express";
+
+const port = 5000;
+const https_port = 5500;
+
+const server = createServer(redirectionHandler);
+
+server.listen(port, 
+    () => console.log(`(Event) Server listening on port ${port}`));
+
+const httpsConfig = {
+    key: readFileSync("key.pem"), 
+    cert: readFileSync("cert.pem")
+};    
+
+const expressApp: Express = express();
+expressApp.get("/favicon.ico", notFoundHandler);
+expressApp.get("/newurl/:message?", newUrlHandler);
+expressApp.get("*", defaultHandler);
+
+const httpsServer = createHttpsServer(httpsConfig, expressApp);
+
+httpsServer.listen(https_port, 
+    () => console.log(`HTTPS Server listening on port ${https_port}`));
--- a/Chapter/webapp/tsconfig.json
+++ b/Chapter/webapp/tsconfig.json
@ -0,0 +1,8 @@
+{
+    "extends": "@tsconfig/node20/tsconfig.json",
+     "compilerOptions": {                       
+         "rootDir": "src",   
+         "outDir": "dist",                                    
+     }
+ }
+ 
--- a/Chapter/webapp/cert.pem
+++ b/Chapter/webapp/cert.pem
@ -0,0 +1,31 @@
+-----BEGIN CERTIFICATE-----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=
+-----END CERTIFICATE-----
--- a/Chapter/webapp/data.json
+++ b/Chapter/webapp/data.json
@ -0,0 +1,14 @@
+{
+    "products": [
+        { "id": 1, "name": "Kayak", "category": "Watersports", 
+            "description": "A boat for one person", "price": 275 },
+        { "id": 2, "name": "Lifejacket", "category": "Watersports", 
+            "description": "Protective and fashionable", "price": 48.95 },
+        { "id": 3, "name": "Soccer Ball", "category": "Soccer", 
+            "description": "FIFA-approved size and weight", 
+            "price": 19.50 },
+        { "id": 4, "name": "Corner Flags", "category": "Soccer", 
+            "description": "Give your playing field a professional touch", 
+            "price": 34.95 }
+    ]
+}
--- a/Chapter/webapp/dist/count_promise.js
+++ b/Chapter/webapp/dist/count_promise.js
@ -0,0 +1,27 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.Count = void 0;
+const worker_threads_1 = require("worker_threads");
+const Count = (request, iterations, total) => {
+    return new Promise((resolve, reject) => {
+        const worker = new worker_threads_1.Worker(__dirname + "/count_worker.js", {
+            workerData: {
+                iterations, total, request
+            }
+        });
+        worker.on("message", (iter) => {
+            const msg = `Request: ${request}, Iteration: ${(iter)}`;
+            console.log(msg);
+        });
+        worker.on("exit", (code) => {
+            if (code !== 0) {
+                reject();
+            }
+            else {
+                resolve();
+            }
+        });
+        worker.on("error", reject);
+    });
+};
+exports.Count = Count;
--- a/Chapter/webapp/dist/count_worker.js
+++ b/Chapter/webapp/dist/count_worker.js
@ -0,0 +1,11 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+const worker_threads_1 = require("worker_threads");
+console.log(`Worker thread ${worker_threads_1.workerData.request} started`);
+for (let iter = 0; iter < worker_threads_1.workerData.iterations; iter++) {
+    for (let count = 0; count < worker_threads_1.workerData.total; count++) {
+        count++;
+    }
+    worker_threads_1.parentPort?.postMessage(iter);
+}
+console.log(`Worker thread ${worker_threads_1.workerData.request} finished`);
--- a/Chapter/webapp/dist/counter_cb.js
+++ b/Chapter/webapp/dist/counter_cb.js
@ -0,0 +1,23 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.Count = void 0;
+const worker_threads_1 = require("worker_threads");
+const Count = (request, iterations, total, callback) => {
+    const worker = new worker_threads_1.Worker(__dirname + "/count_worker.js", {
+        workerData: {
+            iterations,
+            total,
+            request
+        }
+    });
+    worker.on("message", async (iter) => {
+        callback(null, iter);
+    });
+    worker.on("exit", async (code) => {
+        callback(code === 0 ? null : new Error(), true);
+    });
+    worker.on("error", async (err) => {
+        callback(err, true);
+    });
+};
+exports.Count = Count;
--- a/Chapter/webapp/dist/handler.js
+++ b/Chapter/webapp/dist/handler.js
@ -0,0 +1,9 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.basicHandler = void 0;
+const fs_1 = require("fs");
+const basicHandler = (req, resp) => {
+    resp.write((0, fs_1.readFileSync)("static/index.html"));
+    resp.end();
+};
+exports.basicHandler = basicHandler;
--- a/Chapter/webapp/dist/promises.js
+++ b/Chapter/webapp/dist/promises.js
@ -0,0 +1,7 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.writePromise = exports.endPromise = void 0;
+const http_1 = require("http");
+const util_1 = require("util");
+exports.endPromise = (0, util_1.promisify)(http_1.ServerResponse.prototype.end);
+exports.writePromise = (0, util_1.promisify)(http_1.ServerResponse.prototype.write);
--- a/Chapter/webapp/dist/readHandler.js
+++ b/Chapter/webapp/dist/readHandler.js
@ -0,0 +1,26 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.readHandler = void 0;
+const readHandler = async (req, resp) => {
+    if (req.headers["content-type"] == "application/json") {
+        const payload = req.body;
+        if (payload instanceof Array) {
+            //resp.write(`Received an array with ${payload.length} items`)
+            resp.json({ arraySize: payload.length });
+        }
+        else {
+            resp.write("Did not receive an array");
+        }
+        resp.end();
+    }
+    else {
+        req.pipe(resp);
+    }
+};
+exports.readHandler = readHandler;
+// const createFromJsonTransform = () => new Transform({
+//     readableObjectMode: true,
+//     transform(data, encoding, callback) {
+//         callback(null, JSON.parse(data));
+//     }
+// });
--- a/Chapter/webapp/dist/server.js
+++ b/Chapter/webapp/dist/server.js
@ -0,0 +1,25 @@
+"use strict";
+var __importDefault = (this && this.__importDefault) || function (mod) {
+    return (mod && mod.__esModule) ? mod : { "default": mod };
+};
+Object.defineProperty(exports, "__esModule", { value: true });
+const http_1 = require("http");
+const express_1 = __importDefault(require("express"));
+const readHandler_1 = require("./readHandler");
+const port = 5000;
+const expressApp = (0, express_1.default)();
+expressApp.use(express_1.default.json());
+expressApp.post("/read", readHandler_1.readHandler);
+expressApp.get("/sendcity", (req, resp) => {
+    resp.sendFile("city.png", { root: "static" });
+});
+expressApp.get("/downloadcity", (req, resp) => {
+    resp.download("static/city.png");
+});
+expressApp.get("/json", (req, resp) => {
+    resp.json("{name: Bob}");
+});
+expressApp.use(express_1.default.static("static"));
+expressApp.use(express_1.default.static("node_modules/bootstrap/dist"));
+const server = (0, http_1.createServer)(expressApp);
+server.listen(port, () => console.log(`HTTP Server listening on port ${port}`));
--- a/Chapter/webapp/key.pem
+++ b/Chapter/webapp/key.pem
@ -0,0 +1,52 @@
+-----BEGIN PRIVATE KEY-----
+MIIJQgIBADANBgkqhkiG9w0BAQEFAASCCSwwggkoAgEAAoICAQCtaoUVxPOhkOPp
+zCCcE/KDyCOSiBvDwpV7iokfIaavik0R6CixgYKvz8IBpy9C7gYNnSvoCeNl/YKn
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+      "dev": true,
+      "engines": {
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+        "call-bind": "^1.0.0",
+        "get-intrinsic": "^1.0.2",
+        "object-inspect": "^1.9.0"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/ljharb"
+      }
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+      "dependencies": {
+        "through": "2"
+      },
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+        "node": "*"
+      }
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+      "version": "2.0.1",
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+      "engines": {
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+      }
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+      "integrity": "sha512-rT00SPnTVyRsaSz5zgSPma/aHSOic5U1prhYdRy5HS2kTZviFpmDgzilbtsJsxiroqACmayynDN/9VzIbX5DOw==",
+      "dev": true,
+      "dependencies": {
+        "duplexer": "~0.1.1"
+      }
+    },
+    "node_modules/string-argv": {
+      "version": "0.3.2",
+      "resolved": "https://registry.npmjs.org/string-argv/-/string-argv-0.3.2.tgz",
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+      }
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+      "dev": true
+    },
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+      "version": "1.0.1",
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+        "node-cleanup": "^2.1.2",
+        "ps-tree": "^1.2.0",
+        "string-argv": "^0.3.1"
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+      },
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+        "node": ">=12.12.0"
+      },
+      "peerDependencies": {
+        "typescript": "*"
+      }
+    },
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+        "media-typer": "0.3.0",
+        "mime-types": "~2.1.24"
+      },
+      "engines": {
+        "node": ">= 0.6"
+      }
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+      "dev": true,
+      "bin": {
+        "tsc": "bin/tsc",
+        "tsserver": "bin/tsserver"
+      },
+      "engines": {
+        "node": ">=14.17"
+      }
+    },
+    "node_modules/unpipe": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/unpipe/-/unpipe-1.0.0.tgz",
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+      "engines": {
+        "node": ">= 0.8"
+      }
+    },
+    "node_modules/utils-merge": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/utils-merge/-/utils-merge-1.0.1.tgz",
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+      "engines": {
+        "node": ">= 0.4.0"
+      }
+    },
+    "node_modules/vary": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/vary/-/vary-1.1.2.tgz",
+      "integrity": "sha512-BNGbWLfd0eUPabhkXUVm0j8uuvREyTh5ovRa/dyow/BqAbZJyC+5fU+IzQOzmAKzYqYRAISoRhdQr3eIZ/PXqg==",
+      "engines": {
+        "node": ">= 0.8"
+      }
+    },
+    "node_modules/which": {
+      "version": "2.0.2",
+      "resolved": "https://registry.npmjs.org/which/-/which-2.0.2.tgz",
+      "integrity": "sha512-BLI3Tl1TW3Pvl70l3yq3Y64i+awpwXqsGBYWkkqMtnbXgrMD+yj7rhW0kuEDxzJaYXGjEW5ogapKNMEKNMjibA==",
+      "dev": true,
+      "dependencies": {
+        "isexe": "^2.0.0"
+      },
+      "bin": {
+        "node-which": "bin/node-which"
+      },
+      "engines": {
+        "node": ">= 8"
+      }
+    }
+  }
+}
--- a/Chapter/webapp/package.json
+++ b/Chapter/webapp/package.json
@ -0,0 +1,23 @@
+{
+  "name": "webapp",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "start": "tsc-watch --onsuccess \"node dist/server.js\""
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "devDependencies": {
+    "@tsconfig/node20": "^20.1.2",
+    "@types/express": "^4.17.20",
+    "tsc-watch": "^6.0.4",
+    "typescript": "^5.2.2"
+  },
+  "dependencies": {
+    "@types/node": "^20.6.1",
+    "bootstrap": "^5.3.2",
+    "express": "^4.18.2"
+  }
+}
--- a/Chapter/webapp/src/count_promise.ts
+++ b/Chapter/webapp/src/count_promise.ts
@ -0,0 +1,29 @@
+import { Worker } from "worker_threads";
+
+export const Count = (request: number, 
+        iterations: number, total: number) : Promise<void> => {
+
+    return new Promise<void>((resolve, reject) => {
+
+        const worker = new Worker(__dirname + "/count_worker.js", {
+            workerData: {
+                iterations, total, request
+            }
+        });
+
+        worker.on("message", (iter) => {
+            const msg = `Request: ${request}, Iteration: ${(iter)}`;            
+            console.log(msg);            
+        }); 
+
+       worker.on("exit", (code) => {
+            if (code !== 0) {
+                reject();
+            } else {
+                resolve();
+            }
+        });
+        
+       worker.on("error", reject);        
+    });
+}
--- a/Chapter/webapp/src/count_worker.ts
+++ b/Chapter/webapp/src/count_worker.ts
@ -0,0 +1,12 @@
+import { workerData, parentPort  } from "worker_threads";
+
+console.log(`Worker thread ${workerData.request} started`);
+
+for (let iter = 0; iter < workerData.iterations; iter++) {
+    for (let count = 0; count < workerData.total; count++) {
+        count++;
+    }
+    parentPort?.postMessage(iter);
+}
+
+console.log(`Worker thread ${workerData.request} finished`);
--- a/Chapter/webapp/src/counter_cb.ts
+++ b/Chapter/webapp/src/counter_cb.ts
@ -0,0 +1,25 @@
+import { Worker } from "worker_threads";
+
+export const Count = (request: number, iterations: number, total: number, 
+        callback: (err: Error | null, update: number | boolean) => void) => {
+
+    const worker = new Worker(__dirname + "/count_worker.js", {
+        workerData: {
+            iterations, 
+            total, 
+            request
+        }
+    });
+    
+    worker.on("message", async (iter: number) => {
+        callback(null, iter);
+    });
+    
+    worker.on("exit", async (code: number) => {
+        callback(code === 0 ? null : new Error(), true);
+    });
+    
+    worker.on("error", async (err) => {
+        callback(err, true);
+    });        
+}
--- a/Chapter/webapp/src/handler.ts
+++ b/Chapter/webapp/src/handler.ts
@ -0,0 +1,7 @@
+import { IncomingMessage, ServerResponse } from "http";
+import { readFileSync } from "fs";
+
+export const basicHandler = (req: IncomingMessage, resp: ServerResponse) => {  
+    resp.write(readFileSync("static/index.html"));
+    resp.end();
+};
--- a/Chapter/webapp/src/promises.ts
+++ b/Chapter/webapp/src/promises.ts
@ -0,0 +1,8 @@
+import { ServerResponse } from "http";
+import { promisify } from "util";
+
+export const endPromise = promisify(ServerResponse.prototype.end) as 
+    (data: any) => Promise<void>;
+
+export const writePromise = promisify(ServerResponse.prototype.write) as
+    (data: any) => Promise<void>;
--- a/Chapter/webapp/src/readHandler.ts
+++ b/Chapter/webapp/src/readHandler.ts
@ -0,0 +1,25 @@
+import { IncomingMessage, ServerResponse } from "http";
+//import { Transform } from "stream";
+import { Request, Response } from "express";
+
+export const readHandler = async (req: Request, resp: Response) => {    
+    if (req.headers["content-type"] == "application/json") {
+        const payload = req.body;
+        if (payload instanceof Array) {
+            //resp.write(`Received an array with ${payload.length} items`)
+            resp.json({arraySize: payload.length});
+        }  else {
+            resp.write("Did not receive an array");
+        }
+        resp.end();
+    } else {
+        req.pipe(resp);
+    }
+}
+
+// const createFromJsonTransform = () => new Transform({
+//     readableObjectMode: true,
+//     transform(data, encoding, callback) {
+//         callback(null, JSON.parse(data));
+//     }
+// });
--- a/Chapter/webapp/src/server.ts
+++ b/Chapter/webapp/src/server.ts
@ -0,0 +1,31 @@
+import { createServer } from "http";
+import express, {Express, Request, Response } from "express";
+import { readHandler } from "./readHandler";
+
+const port = 5000;
+
+const expressApp: Express = express();
+
+expressApp.use(express.json());
+
+expressApp.post("/read", readHandler);
+
+expressApp.get("/sendcity", (req, resp) => {
+    resp.sendFile("city.png", { root: "static"});
+});
+
+expressApp.get("/downloadcity", (req: Request, resp: Response) => {
+    resp.download("static/city.png");
+});
+
+expressApp.get("/json", (req: Request, resp: Response) => {
+    resp.json("{name: Bob}");
+});
+    
+expressApp.use(express.static("static"));
+expressApp.use(express.static("node_modules/bootstrap/dist"));
+
+const server = createServer(expressApp);
+
+server.listen(port, 
+    () => console.log(`HTTP Server listening on port ${port}`));
--- a/Chapter/webapp/static/city.png
+++ b/Chapter/webapp/static/city.png
--- a/Chapter/webapp/static/client.js
+++ b/Chapter/webapp/static/client.js
@ -0,0 +1,17 @@
+document.addEventListener('DOMContentLoaded', function() {
+    document.getElementById("btn").addEventListener("click", sendReq);
+});
+sendReq = async () => {
+    let payload = [];
+    for (let i = 0; i < 5; i++) {
+        payload.push({ id: i, message: `Payload Message: ${i}\n`});
+    }
+    const response = await fetch("/read", {
+        method: "POST", body: JSON.stringify(payload), 
+        headers: {
+            "Content-Type": "application/json"
+        }
+    })
+    document.getElementById("msg").textContent = response.statusText;
+    document.getElementById("body").textContent = await response.text();
+}
--- a/Chapter/webapp/static/index.html
+++ b/Chapter/webapp/static/index.html
@ -0,0 +1,13 @@
+<!DOCTYPE html>
+<html>
+    <head>
+        <script src="client.js"></script>
+        <link href="css/bootstrap.min.css" rel="stylesheet" />
+    </head>
+    <body>
+       <img src="city.png" style="width: 100%; display: block; margin-bottom: 2px;">
+       <button id="btn" class="btn btn-primary my-2">Send Request</button>
+       <div id="msg"></div>
+       <div id="body"></div>
+    </body>
+</html>
--- a/Show More
+++ b/Show More