python data_error ai_generated true

werkzeug.exceptions.UnsupportedMediaType: 415 Unsupported Media Type: Did not attempt to load JSON data because the request Content-Type was not 'application/json'.

ID: python/flask-json-415-unsupported-media-type

Also available as: JSON · Markdown · 中文
80%Fix Rate
85%Confidence
0Evidence
2024-09-03First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
2.x active — — —
3.x active — — —

Root Cause

request.get_json() called but the client sent no Content-Type: application/json header (common with curl or fetch defaults).

generic

中文

调用了 request.get_json()，但客户端未发送 Content-Type: application/json 头（常见于 curl 或 fetch 默认行为）。

Workarounds

  1. 95% success 
    curl -X POST -H 'Content-Type: application/json' -d '{"a":1}' http://localhost:5000/api
  2. 88% success 
    data = request.get_json(silent=True) or {}  # explicit fallback for non-JSON

Dead Ends

Common approaches that don't work:

  1. 55% fail

    Hides the contract bug and can produce confusing 400s on malformed bodies.

  2. 70% fail

    Returns wrong status; client still gets no data.