Fix: Need to read full message, can't return streaming

This fixes errors that looked like this:

Traceback (most recent call last):
  File "/opt/miniconda3/envs/swea13/lib/python3.13/site-packages/uvicorn/protocols/http/h11_impl.py", line 406, in run_asgi
    result = await app(  # type: ignore[func-returns-value]
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
        self.scope, self.receive, self.send
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    )
    ^
  File "/opt/miniconda3/envs/swea13/lib/python3.13/site-packages/uvicorn/middleware/proxy_headers.py", line 60, in __call__
    return await self.app(scope, receive, send)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/miniconda3/envs/swea13/lib/python3.13/site-packages/fastapi/applications.py", line 1054, in __call__
    await super().__call__(scope, receive, send)
  File "/opt/miniconda3/envs/swea13/lib/python3.13/site-packages/starlette/applications.py", line 113, in __call__
    await self.middleware_stack(scope, receive, send)
  File "/opt/miniconda3/envs/swea13/lib/python3.13/site-packages/starlette/middleware/errors.py", line 187, in __call__
    raise exc
  File "/opt/miniconda3/envs/swea13/lib/python3.13/site-packages/starlette/middleware/errors.py", line 165, in __call__
    await self.app(scope, receive, _send)
  File "/opt/miniconda3/envs/swea13/lib/python3.13/site-packages/starlette/middleware/base.py", line 185, in __call__
    with collapse_excgroups():
         ~~~~~~~~~~~~~~~~~~^^
  File "/opt/miniconda3/envs/swea13/lib/python3.13/contextlib.py", line 162, in __exit__
    self.gen.throw(value)
    ~~~~~~~~~~~~~~^^^^^^^
  File "/opt/miniconda3/envs/swea13/lib/python3.13/site-packages/starlette/_utils.py", line 82, in collapse_excgroups
    raise exc
  File "/opt/miniconda3/envs/swea13/lib/python3.13/site-packages/starlette/middleware/base.py", line 187, in __call__
    response = await self.dispatch_func(request, call_next)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/fuchur/Documents/24/git_sync/swe-rex/src/swerex/server.py", line 92, in handle_request_id
    new_response = Response(
        content=body_stream(),
    ...<2 lines>...
        media_type=response.media_type,
    )
  File "/opt/miniconda3/envs/swea13/lib/python3.13/site-packages/starlette/responses.py", line 43, in __init__
    self.body = self.render(content)
                ~~~~~~~~~~~^^^^^^^^^
  File "/opt/miniconda3/envs/swea13/lib/python3.13/site-packages/starlette/responses.py", line 51, in render
    return content.encode(self.charset)  # type: ignore
           ^^^^^^^^^^^^^^
AttributeError: 'async_generator' object has no attribute 'encode'

Author: klieret

src/swerex/server.py

@@ -85,12 +85,12 @@ async def handle_request_id(request: Request, call_next):
 
     response = await call_next(request)
 
-    async def body_stream():
-        async for chunk in response.body_iterator:
-            yield chunk
+    body_content = b""
+    async for chunk in response.body_iterator:
+        body_content += chunk
 
     new_response = Response(
-        content=body_stream(),
+        content=body_content,
         status_code=response.status_code,
         headers=dict(response.headers),
         media_type=response.media_type,