python runtime_error ai_generated true

werkzeug.routing.exceptions.BuildError: Could not build url for endpoint 'login'

ID: python/werkzeug-builderror-could-not-build-url

Also available as: JSON · Markdown · 中文
80%Fix Rate
86%Confidence
0Evidence
2024-05-20First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
3.x active — — —

Root Cause

Endpoint name does not exist or required URL parameters are missing.

generic

中文

端点名称不存在或缺少必需的URL参数。

Workarounds

  1. 90% success Check endpoint name and provide all parameters 
    url_for('login', next='/dashboard')
  2. 85% success List all endpoints with app.url_map 
    print(app.url_map)

Dead Ends

Common approaches that don't work:

  1. Assuming endpoint name is the function name without decorator 60% fail

    Flask endpoint defaults to function name, but can be overridden.

  2. Missing required parameter in url_for 80% fail

    If route has path parameters, they must be provided.