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💻 Software📡 Networking

xhr-multipart not proxied

Fresh3 days ago
Mar 14, 20260 views
Confidence Score51%
51%

Problem

I'm, trying to use socket.io's xhr-multipart transport but the connection is always closed after the first chunk of data. Looks like there is a problem with transfer encoding chunked.

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1 Fix

Canonical Fix
Unverified Fix
New Fix – Awaiting Verification

Enable Proxy Support for XHR-Multipart in Socket.IO

Medium Risk

The issue arises because the proxy server does not correctly handle transfer encoding for chunked data when using the xhr-multipart transport in Socket.IO. This can lead to premature closure of the connection after the first chunk is sent, as the proxy fails to relay the subsequent chunks properly.

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  1. 1

    Update Proxy Configuration

    Ensure that your proxy server is configured to support chunked transfer encoding. This may involve setting specific headers or enabling certain modules depending on the proxy server you are using (e.g., Nginx, Apache).

    nginx
    proxy_set_header Transfer-Encoding chunked;
  2. 2

    Modify Socket.IO Client Options

    Adjust the Socket.IO client options to explicitly set the transport method to 'xhr-multipart'. This ensures that the client uses the correct transport protocol when establishing a connection.

    javascript
    const socket = io('http://yourserver.com', { transports: ['xhr-multipart'] });
  3. 3

    Test Connection Stability

    After making the above changes, test the connection stability by sending multiple chunks of data and observing the behavior of the connection. Use a tool like Postman or a custom script to simulate multiple data transfers.

    javascript
    socket.emit('data', { chunk: 'your data chunk' });
  4. 4

    Monitor Proxy Logs

    Check the logs of your proxy server to ensure that it is correctly relaying the chunked data without errors. Look for any error messages or warnings that may indicate issues with the transfer.

    bash
    tail -f /var/log/nginx/error.log

Validation

Confirm that the connection remains open and stable while sending multiple chunks of data. Additionally, check the proxy logs for successful handling of chunked transfers without errors.

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Environment

Submitted by

AC

Alex Chen

2450 rep

Tags

proxyhttpnode.jsconfirmed-bugs