python encoding_error ai_generated true

UnicodeDecodeError: 'utf-8' codec can't decode byte 0xff in position 0: invalid start byte

ID: python/flask-unicode-decode-error

Also available as: JSON · Markdown · 中文
80%Fix Rate
85%Confidence
0Evidence
2024-05-28First Seen

Version Compatibility

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

Root Cause

`request.data.decode()` or reading a form field assumed UTF-8 but the client sent another encoding (e.g., Windows-1252 or binary).

generic

中文

`request.data.decode()` 或读取表单字段时假设 UTF-8，但客户端发送了其他编码（如 Windows-1252 或二进制）。

Workarounds

  1. 92% success 
    charset = request.mimetype_params.get('charset', 'utf-8')
text = request.data.decode(charset)
  2. 90% success 
    try:
    text = request.data.decode('utf-8')
except UnicodeDecodeError:
    return jsonify(error='invalid encoding'), 400

Dead Ends

Common approaches that don't work:

  1. 75% fail

    Silently drops bytes; corrupts data.

  2. 90% fail

    Output config, not input decoding.