python network_error ai_generated true

starlette.exceptions.HTTPException: 404 Not Found

ID: python/starlette-http-exception-not-found

Also available as: JSON · Markdown · 中文
80%Fix Rate
82%Confidence
0Evidence
2024-07-10First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
3.x active — — —

Root Cause

Requested URL does not match any route in the Starlette application.

generic

中文

请求的 URL 与 Starlette 应用中的任何路由不匹配。

Workarounds

  1. 90% success 
    from starlette.applications import Starlette
from starlette.routing import Route

async def homepage(request):
    return Response('Hello')

routes = [Route('/', homepage)]
app = Starlette(routes=routes)
# Ensure route paths are correct with trailing slashes
  2. 85% success 
    Add a custom 404 handler: 
from starlette.exceptions import HTTPException
from starlette.responses import JSONResponse

async def not_found(request, exc):
    return JSONResponse(status_code=404, content={"message": "Not Found"})

app.add_exception_handler(HTTPException, not_found)

Dead Ends

Common approaches that don't work:

  1. 75% fail

    Catch-all routes may shadow specific routes if defined first.

  2. 60% fail

    Middleware cannot easily modify response status; may cause recursion.