python runtime_error ai_generated true

RuntimeError: No route matches for path '/api/items/123'

ID: python/starlette-runtimeerror-no-route-match

Also available as: JSON · Markdown · 中文
80%Fix Rate
82%Confidence
0Evidence
2024-05-20First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
3.x active — — —

Root Cause

The requested URL path does not match any defined route in the Starlette application.

generic

中文

请求的 URL 路径与 Starlette 应用程序中定义的任何路由不匹配。

Workarounds

  1. 95% success Define a route with path parameter. 
    from starlette.applications import Starlette
from starlette.responses import JSONResponse
app = Starlette()
@app.route('/api/items/{item_id}')
async def get_item(request):
    return JSONResponse({'id': request.path_params['item_id']})
  2. 90% success Add a 404 handler for unmatched routes. 
    from starlette.responses import PlainTextResponse
@app.exception_handler(404)
async def not_found(request, exc):
    return PlainTextResponse('Not Found', status_code=404)

Dead Ends

Common approaches that don't work:

  1. Adding a catch-all route without proper order. 50% fail

    Catch-all routes must be defined last; otherwise they override specific routes.

  2. Using regular expression in route path incorrectly. 60% fail

    Starlette uses path parameters with curly braces, not regex. Misuse leads to no match.