flask-ws/app.py

import os
import prefix
from flask import Flask, render_template
from flask_sock import Sock

app = Flask(__name__, )
sock = Sock(app)



app.wsgi_app = prefix.PrefixMiddleware(
    app.wsgi_app, prefix=os.environ.get("URL_PREFIX", "")
)


@app.route('/')
def index():
    return render_template('index.html')


@sock.route('/echo/')
def echo(sock):
    while True:
        data = sock.receive()
        sock.send(data)