web/main.py

from flask import request, Flask, render_template

app = Flask(__name__)

@app.route('/', methods=['GET', 'POST'])
def hello_world():
    if request.method == 'GET':
        return render_template('index.html')
    elif request.method == 'POST':
        return request.form

@app.errorhandler(405)
def method_not_allowed(e):
    return render_template('405.html'), 405