python runtime_error ai_generated true

werkzeug.routing.exceptions.BuildError: Could not build url for endpoint 'static' with values ['filename']. Did you forget to specify values ['filename']?

ID: python/flask-url-for-external-https

Also available as: JSON · Markdown · 中文
80%Fix Rate
88%Confidence
0Evidence
2024-06-15First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
3.x active — — —

Root Cause

url_for('static', ...) was called without the required filename argument, or the endpoint name was misspelled.

generic

中文

调用 url_for('static', ...) 时未提供必需的 filename 参数，或端点名称拼写错误。

Workarounds

  1. 98% success 
    url_for('static', filename='css/app.css')
  2. 85% success 
    print([r.endpoint for r in app.url_map.iter_rules()])

Dead Ends

Common approaches that don't work:

  1. 85% fail

    Breaks asset links; static files 404 in production.

  2. 70% fail

    Ignores url_prefix and CDN configuration.