Flask and RESTAPI

from flask import Flask

app = Flask(__name__)

# Define a route for the root URI
@app.route("/")
def index():                           
    # Return the content for the home page
    return "<h1>Home page!</h1>"

# Define a route for the "/hello" URI
@app.route("/hello")
def hello():
    # Return the content for the hello page
    return "<h1>Hello!!</h1>"

# Define a route for the "/first" URI
@app.route("/first")
def first():
    # Return the content for the first page
    return "<h3>First page!!</h3>"

if __name__ == "__main__":              
    app.run(host="0.0.0.0", port="5555")

from flask import Flask

app = Flask(__name__)

@app.route("/")
def index():                           
    return "<h1>Home page!</h1>"

@app.route("/hello")
def hello():
    return "<h1>Hello!!</h1>"

@app.route("/first")
def first():
    return "<h3>First page!!</h3>"

# Define a route that accepts a dynamic variable `username`
@app.route("/profile/<username>")
def get_profile(username):
    # Dynamically return the username passed in the URI
    return f'<h1>Hello my name is {username}</h1>'

if __name__ == "__main__":              
    app.run(host="0.0.0.0", port="5555")

from flask import Flask

app = Flask(__name__)

@app.route("/")
def index():                           
    return "<h1>Home page!</h1>"

@app.route("/hello")
def hello():
    return "<h1>Hello!!</h1>"

@app.route("/first")
def first():
    return "<h3>First page!!</h3>"

@app.route("/profile/<username>")
def get_profile(username):
    return f'<h1>Hello my name is {username}</h1>'

# Define a route with an integer variable `message_id`
@app.route("/message/<int:message_id>")
def get_message(message_id):
    # Dynamically return the integer `message_id` passed in the URI
    return f'<h3>Message id: {message_id}</h3>'

if __name__ == "__main__":              
    app.run(host="127.0.0.1", port="5555")

from flask import Flask, jsonify
app = Flask(__name__)

# Create a route that returns JSON data using jsonify()
@app.route('/json_test')
def hello_json():
    # Define data as a dictionary and return it in JSON format
    data = {'first name': 'Woong-Keol', 'last name': 'Kim'}
    return jsonify(data)

# Create another route that provides server information in JSON format
@app.route('/server_info')
def server_json():
    data = {'server_name': 'localhost', 'server_port': '5555'}
    return jsonify(data)

if __name__ == "__main__":              
    app.run(host="127.0.0.1", port="5555")

from flask import Flask, jsonify, request

app = Flask(__name__)

@app.route('/')
def index():
    return '<h1>Welcome to Homepage</h1>'

# Create a route for login authentication
@app.route('/login')
def login():
    # Retrieve the username from query parameters
    username = request.args.get('user_name')
    if username == 'Kim':
        ret_data = {'auth': 'success'}
    else:
        ret_data = {'auth': 'failed'}
    return jsonify(ret_data)

if __name__ == '__main__':
    # Run the Flask application
    app.run(host='0.0.0.0', port='5555')

#### Enhanced Version: Adding Multiple Parameters for Login Authentication

from flask import Flask, jsonify, request

app = Flask(__name__)

@app.route('/')
def index():
    return '<h1>Welcome to Homepage</h1>'

# Route to handle login with multiple parameters
@app.route('/login')
def login():
    # Retrieve multiple query parameters from the request
    username = request.args.get('user_name')
    pw = request.args.get('pw')
    email = request.args.get('email_addr')

    # Validate username and password
    if username == 'Kim':
        if pw == 'password':
            ret_data = {'auth': 'success', 'email_address':email}
        else:
            ret_data = {'auth': 'failed'}
    else:
        ret_data = {'auth': 'failed'}
    return jsonify(ret_data)

if __name__ == '__main__':
    app.run(host='0.0.0.0', port='5555')