The _wrap_well_known_endpoint function assumed all route endpoints are regular
request handlers (async def handler(request) -> Response). However, the MCP
SDK's cors_middleware wraps handlers with CORSMiddleware, which is an ASGI app
expecting (scope, receive, send). When the wrapper called
`await endpoint(request)` on a CORSMiddleware instance, it passed only 1
argument instead of the required 3 ASGI args.
The fix detects whether the endpoint is a regular handler function or an ASGI
app (using the same inspect check as Starlette's Route constructor), and uses
the appropriate calling convention:
- Regular handlers: called as `await endpoint(request)` (existing behavior)
- ASGI apps: invoked via the ASGI interface `await endpoint(scope, receive, send)`
with response capture to apply cache-busting headers
https://claude.ai/code/session_011S5zFTWRfKBJBUEanrhvQg
cd326d0f2d