python network_error ai_generated true

fastapi.exceptions.HTTPException: 413: Request Entity Too Large

ID: python/fastapi-file-upload-too-large

Also available as: JSON · Markdown · 中文
80%Fix Rate
83%Confidence
0Evidence
2024-09-27First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
3.x active — — —

Root Cause

The uploaded file exceeds the server or reverse proxy body size limit (e.g. nginx client_max_body_size).

generic

中文

上传文件超过服务器或反向代理的请求体大小限制（如 nginx client_max_body_size）。

Workarounds

  1. 92% success 
    client_max_body_size 50m;
  2. 85% success 
    async for chunk in request.stream():
    await save_chunk(chunk)

Dead Ends

Common approaches that don't work:

  1. 90% fail

    FastAPI has no built-in limit; the block is at nginx/gunicorn.

  2. 85% fail

    Same payload will always exceed the limit.