Adding source code files for Chapter 10

Chapter10/webapps/app4.py

@@ -0,0 +1,25 @@
+#app4.py: extracting parameters from different requests
+from flask import Flask, request, render_template
+
+app = Flask(__name__)
+
+@app.route('/hello')
+@app.route('/hello/<fname> <lname>')
+def hello_user(fname=None, lname=None):
+    return render_template('app4.html', name=f"{fname} {lname}")
+
+@app.get('/submit')
+def process_get_request_data():
+    fname = request.args['fname']
+    lname = request.args.get('lname', '')
+    return render_template('app4.html', name=f"{fname} {lname}")
+
+@app.post('/submit')
+def process_post_request_data():
+    fname = request.form['fname']
+    lname = request.form.get('lname','')
+    #lname = request.form['lname']
+    return render_template('app4.html', name=f"{fname} {lname}")
+
+if __name__ == '__main__':
+    app.run()