# FastAPI + ELASTIC\_APM\_CAPTURE\_BODY: Unexpected message received: http.request **URL:** \ **Category:** APM\ **Tags:** python\ **Created:** [November 4, 2024, 8:52pm UTC](https://discuss.elastic.co/t/fastapi-elastic-apm-capture-body-unexpected-message-received-http-request/370031 "2024-11-04T20:52:36Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![mkaniaa](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/mkaniaa/32/138787_2.png) [@mkaniaa](https://discuss.elastic.co/u/mkaniaa)\ **Post date:** [November 4, 2024, 8:52pm UTC](https://discuss.elastic.co/t/fastapi-elastic-apm-capture-body-unexpected-message-received-http-request/370031/1 "2024-11-04T20:52:36Z")
Hello! I'm running a FastAPI application (v0.111) with Elastic APM integrated via the `elastic-apm` package (v6.22.3). The setup had been working smoothly until I modified the APM configuration, setting `ELASTIC_APM_CAPTURE_BODY` to `"all"`. Following this change, I started encountering the following error: ```auto ERROR: Exception in ASGI application + Exception Group Traceback (most recent call last): | File "/usr/local/lib/python3.12/site-packages/starlette/middleware/base.py", line 192, in __call__ | await response(scope, wrapped_receive, send) | File "/usr/local/lib/python3.12/site-packages/starlette/responses.py", line 258, in __call__ | async with anyio.create_task_group() as task_group: | ^^^^^^^^^^^^^^^^^^^^^^^^^ | File "/usr/local/lib/python3.12/site-packages/anyio/_backends/_asyncio.py", line 763, in __aexit__ | raise BaseExceptionGroup( | ExceptionGroup: unhandled errors in a TaskGroup (1 sub-exception) +-+---------------- 1 ---------------- | Traceback (most recent call last): | File "/usr/local/lib/python3.12/site-packages/uvicorn/protocols/http/httptools_impl.py", line 401, in run_asgi | result = await app( # type: ignore[func-returns-value] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | File "/usr/local/lib/python3.12/site-packages/uvicorn/middleware/proxy_headers.py", line 60, in __call__ | return await self.app(scope, receive, send) | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | File "/usr/local/lib/python3.12/site-packages/fastapi/applications.py", line 1054, in __call__ | await super(). __call__ (scope, receive, send) | File "/usr/local/lib/python3.12/site-packages/starlette/applications.py", line 123, in __call__ | await self.middleware_stack(scope, receive, send) | File "/usr/local/lib/python3.12/site-packages/elasticapm/instrumentation/packages/asyncio/starlette.py", line 48, in call | return await wrapped(*args, **kwargs) | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | File "/usr/local/lib/python3.12/site-packages/starlette/middleware/errors.py", line 186, in __call__ | raise exc | File "/usr/local/lib/python3.12/site-packages/starlette/middleware/errors.py", line 164, in __call__ | await self.app(scope, receive, _send) | File "/usr/local/lib/python3.12/site-packages/elasticapm/contrib/starlette/ __init__.py", line 199, in __call__ | await self.app(scope, _request_receive or receive, wrapped_send) | File "/usr/local/lib/python3.12/site-packages/starlette/middleware/base.py", line 189, in __call__ | with collapse_excgroups(): | ^^^^^^^^^^^^^^^^^^^^ | File "/usr/local/lib/python3.12/contextlib.py", line 158, in __exit__ | self.gen.throw(value) | File "/usr/local/lib/python3.12/site-packages/starlette/_utils.py", line 93, in collapse_excgroups | raise exc | File "/usr/local/lib/python3.12/site-packages/starlette/responses.py", line 265, in __call__ | await wrap(partial(self.listen_for_disconnect, receive)) | File "/usr/local/lib/python3.12/site-packages/starlette/responses.py", line 261, in wrap | await func() | File "/usr/local/lib/python3.12/site-packages/starlette/responses.py", line 238, in listen_for_disconnect | message = await receive() | ^^^^^^^^^^^^^^^ | File "/usr/local/lib/python3.12/site-packages/starlette/middleware/base.py", line 58, in wrapped_receive | raise RuntimeError(f"Unexpected message received: {msg['type']}") | RuntimeError: Unexpected message received: http.request ``` This error looks very similar to the issue reported on FastAPI's GitHub (see [discussion #10868](https://github.com/fastapi/fastapi/discussions/10868)), which also involves capturing body in the FastAPI middleware. Does anyone have experience with this or insights into how to resolve it? Specifically, could this be a compatibility issue between the FastAPI version, Starlette, and Elastic APM w ---
**Author:** ![mkaniaa](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/mkaniaa/32/138787_2.png) [@mkaniaa](https://discuss.elastic.co/u/mkaniaa)\ **Post date:** [November 8, 2024, 12:15pm UTC](https://discuss.elastic.co/t/fastapi-elastic-apm-capture-body-unexpected-message-received-http-request/370031/4 "2024-11-08T12:15:13Z")
The problem still persists in my application, I would be very grateful for your help. ---
**Author:** ![riccardom](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/riccardom/32/132044_2.png) [@riccardom](https://discuss.elastic.co/u/riccardom)\ **Post date:** [November 8, 2024, 3:01pm UTC](https://discuss.elastic.co/t/fastapi-elastic-apm-capture-body-unexpected-message-received-http-request/370031/5 "2024-11-08T15:01:26Z")
Looking at your exception it looks like when the apm agent sends all the body we have read inside a message of type `http.request` , starlette.middleware's \_CachedRequest expects to receive an `http.disconnect` instead because everything has been consumed. I don't see anything obviously wrong on the apm middleware though. ---
**Author:** ![mkaniaa](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/mkaniaa/32/138787_2.png) [@mkaniaa](https://discuss.elastic.co/u/mkaniaa)\ **Post date:** [November 8, 2024, 3:17pm UTC](https://discuss.elastic.co/t/fastapi-elastic-apm-capture-body-unexpected-message-received-http-request/370031/6 "2024-11-08T15:17:08Z")
So this is a conflict between starlette.middleware's \_CachedRequest and APM middleware? How can I resolve this conflict?