python type_error ai_generated true

TypeError: Object of type HTTPException is not JSON serializable

ID: python/fastapi-http-exception-not-json

Also available as: JSON · Markdown · 中文
80%Fix Rate
88%Confidence
0Evidence
2024-05-04First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
0.100+ active — — —

Root Cause

A route returned an HTTPException instance instead of raising it, so FastAPI tried to serialize the exception object as the response body.

generic

中文

路由返回了 HTTPException 实例而不是抛出它，导致 FastAPI 尝试将异常对象序列化为响应正文。

Workarounds

  1. 98% success 
    raise HTTPException(status_code=404, detail='Not found')
  2. 90% success 
    from fastapi.responses import JSONResponse
return JSONResponse(status_code=404, content={'detail': 'Not found'})

Dead Ends

Common approaches that don't work:

  1. 85% fail

    Returns a 200 with exception internals in the body instead of an error status.

  2. 70% fail

    Leaks stack/details and still uses the wrong status code.