This snippet creates a proxy from localhost:5000 to an entire website.

website-proxy.py

import requests

from flask import Flask, request, Response, stream_with_context
from functools import wraps


app = Flask('test', static_folder=None)


def check_auth(username, password):
    """This function is called to check if a username /
    password combination is valid.
    """
    return username == 'admin' and password == 'secret'


def authenticate():
    """Sends a 401 response that enables basic auth"""
    return Response(
        'Could not verify your access level for that URL.\n'
        'You have to login with proper credentials', 401,
        {
            'WWW-Authenticate': 'Basic realm="Login Required"'
        }
    )


def requires_auth(f):
    @wraps(f)
    def decorated(*args, **kwargs):
        auth = request.authorization
        if not auth or not check_auth(auth.username, auth.password):
            return authenticate()
        return f(*args, **kwargs)
    return decorated


def forward_request(location, request):
    r = requests.get(location)
    return Response(
        stream_with_context(r.iter_content()),
        content_type=r.headers['content-type'],
        headers=dict(request.headers))


@app.route('/')
@requires_auth
def index():
    return forward_request('https://balthazar-rouberol.com/', request)


@app.route('/<path:url>')
def plop(url):
    return forward_request('https://balthazar-rouberol.com/' + url, request)


if __name__ == '__main__':
    app.run(host='localhost', port=5000, debug=True)