communication protocol_error ai_generated true

WebSocket frame exceeds maximum size: 65535 bytes

ID: communication/websocket-message-too-large-fragmentation

Also available as: JSON · Markdown · 中文
82%Fix Rate
88%Confidence
1Evidence
2023-11-07First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
Node.js ws 8.13.0 active — — —
Python websockets 12.0 active — — —
Go gorilla/websocket 1.5.1 active — — —
Java Tyrus 2.0.0 active — — —
Nginx 1.25.0 active — — —

Root Cause

A WebSocket frame payload exceeds the 16-bit length limit (65535 bytes) when the application sends data without enabling fragmentation or using extension frames, violating RFC 6455 section 5.2.

generic

中文

WebSocket帧的有效载荷超过16位长度限制（65535字节），原因是应用程序在未启用分片或使用扩展帧的情况下发送数据，违反了RFC 6455第5.2节。

Official Documentation

https://datatracker.ietf.org/doc/html/rfc6455#section-5.2

Workarounds

  1. 90% success Enable WebSocket fragmentation in the sender: for Python websockets, use 'await websocket.send(message, fragment_size=16384)' to automatically split large messages into multiple frames. 
    Enable WebSocket fragmentation in the sender: for Python websockets, use 'await websocket.send(message, fragment_size=16384)' to automatically split large messages into multiple frames.
  2. 85% success Implement application-level chunking: split the payload into chunks of < 65535 bytes on the client and reassemble on the server using a sequence ID. 
    Implement application-level chunking: split the payload into chunks of < 65535 bytes on the client and reassemble on the server using a sequence ID.
  3. 75% success Use WebSocket extensions like 'permessage-deflate' to compress data, reducing payload size below the limit. 
    Use WebSocket extensions like 'permessage-deflate' to compress data, reducing payload size below the limit.

中文步骤

  1. Enable WebSocket fragmentation in the sender: for Python websockets, use 'await websocket.send(message, fragment_size=16384)' to automatically split large messages into multiple frames.
  2. Implement application-level chunking: split the payload into chunks of < 65535 bytes on the client and reassemble on the server using a sequence ID.
  3. Use WebSocket extensions like 'permessage-deflate' to compress data, reducing payload size below the limit.

Dead Ends

Common approaches that don't work:

  1. Increase the frame size limit in the WebSocket library configuration 85% fail

    The RFC mandates a maximum frame payload of 2^16-1 bytes for unfragmented frames; increasing the limit may cause protocol-level errors or disconnection.

  2. Switch to HTTP/2 streaming instead of WebSocket 90% fail

    HTTP/2 streaming has different semantics and may not support bidirectional real-time communication; it requires significant application redesign.

  3. Compress the data before sending to reduce payload size 70% fail

    Compression may not be feasible for binary data or real-time streams, and it adds CPU overhead; it also doesn't address the root cause of not using fragmentation.