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0.7 doesn't work on Dotcloud, but 0.6.18 does.

Fresh3 days ago
Mar 14, 20260 views
Confidence Score55%
55%

Problem

I'm not sure what changed to cause this issue, but Socket.IO 0.7 isn't working on Dotcloud. They don't support WebSockets yet, so I've been using the XHR-Polling transport, but even that fails on 0.7--in fact; ALL transports fail on 0.7. The initial XHR request to acquire the session ID works fine, but once it starts trying to poll with it the requests just hang. It works fine on localhost, so I asked Dotcloud support about it and they are pointing the finger back at Socket.IO so I'm not sure what to do about that. Any ideas?

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1 Fix

Canonical Fix
Unverified Fix
New Fix – Awaiting Verification

Downgrade Socket.IO to 0.6.18 for Compatibility with Dotcloud

Medium Risk

Socket.IO 0.7 introduced changes in the transport layer that may not be compatible with Dotcloud's infrastructure, particularly in how it handles polling requests. Since Dotcloud does not support WebSockets, the failure of all transports in 0.7 indicates that the new transport mechanisms are not functioning correctly in their environment.

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  1. 1

    Uninstall Socket.IO 0.7

    Remove the current version of Socket.IO from your project to prevent conflicts with the older version.

    bash
    npm uninstall socket.io
  2. 2

    Install Socket.IO 0.6.18

    Install the last known working version of Socket.IO that is compatible with Dotcloud's infrastructure.

    bash
    npm install socket.io@0.6.18
  3. 3

    Update Transport Options

    Ensure that the transport options in your Socket.IO configuration are set to use XHR-Polling explicitly, as this is the only supported transport on Dotcloud.

    javascript
    var io = require('socket.io')(server, { transports: ['xhr-polling'] });
  4. 4

    Test the Application

    Deploy your application to Dotcloud and test the Socket.IO functionality to ensure that it works as expected with the downgraded version.

    bash
    curl -X GET http://your-dotcloud-app-url/socket.io/?EIO=3&transport=xhr-polling
  5. 5

    Monitor for Errors

    After deployment, monitor the application logs for any errors related to Socket.IO to confirm that the issue has been resolved.

    bash
    heroku logs --tail

Validation

Confirm that the application successfully establishes a connection with Socket.IO and that real-time events are functioning as expected without hanging requests. Check the application logs for any errors related to Socket.IO.

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Environment

Submitted by

AC

Alex Chen

2450 rep

Tags

socket.iowebsocketrealtimebug