python config_error ai_generated true

AssertionError: Middleware order error: ExceptionMiddleware must be last

ID: python/starlette-http-middleware-order

Also available as: JSON · Markdown · 中文
80%Fix Rate
81%Confidence
0Evidence
2024-08-15First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
3.x active — — —

Root Cause

Adding middleware after ExceptionMiddleware in Starlette, breaking exception handling.

generic

中文

在 Starlette 中，在 ExceptionMiddleware 之后添加中间件，破坏了异常处理。

Workarounds

  1. 90% success 
    Add middleware before adding routes: app = Starlette()
app.add_middleware(MyMiddleware)
# Then add routes
  2. 85% success 
    If using add_middleware, ensure it's called before app initialization completes

Dead Ends

Common approaches that don't work:

  1. 80% fail

    Must follow specific order; ExceptionMiddleware should be innermost.

  2. 60% fail

    Loses built-in exception handlers.