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Problems with receiving 'utf-8' from client #674

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bstojkovic opened this issue Mar 27, 2018 · 2 comments
Closed

Problems with receiving 'utf-8' from client #674

bstojkovic opened this issue Mar 27, 2018 · 2 comments

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@bstojkovic
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I am trying to create a 2-way communication between server and client using Flask and socket.io.

Everything works fine until server receives utf-8 string from client, which gets garbled. Sending from server to client works fine, and prior to sending from client to server, the client prints the message correctly.

Here is some code that reproduces the problem:

app.py:

import flask
from flask_socketio import SocketIO, emit, disconnect

import json

app = flask.Flask(__name__)
socket_io = SocketIO(app)

@socket_io.on('pull')
def socket_io_handle_pull():
    json_msg = {
        'msg': "abcćčddžđefghijklmnnjoprsštuvzž"
    }
    print("Pushing", json_msg)

    socket_io.emit('response', json_msg)

@socket_io.on('push')
def socket_io_handle_push(json_msg):
    print("Pushed:", json_msg)

@socket_io.on('disconnect')
def socket_io_handle_disconnect():
    disconnect()

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

if __name__ == '__main__':
    socket_io.run(app)

index.html:

<!DOCTYPE html>
<html>
  <head>
    <script type="text/javascript" src="//cdnjs.cloudflare.com/ajax/libs/socket.io/1.3.6/socket.io.min.js"></script>
  </head>
  <body>
    <script type="text/javascript">
      var socket = io.connect('http://' + document.domain + ':' + location.port);

      socket.on('response', json => {
        socket.emit('push', json);
      })

      socket.emit('pull');
    </script>
  </body>
</html>

Output:

Pushing {'msg': 'abcćčddžđefghijklmnnjoprsštuvzž'}
Pushed: {'msg': 'abcÄ\x87Ä\x8dddA3Ä\x91efghijklmnnjoprsA!tuvzA3'}

From SO question.
@bstojkovic
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Socket.IO version:

> pip3 show flask-socketio
Name: Flask-SocketIO
Version: 2.9.3

@bstojkovic
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bstojkovic commented Mar 27, 2018 •
edited
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Miguel:
You are using the 1.x versions of the Socket.IO client, which had known problems with double-encoding of UTF-8 strings. You should try the 2.x versions which have resolved this issue.

I updated to socket.io 2.0.4 and it works fine now! Thank you so much.

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@bstojkovic