Too much data for declared Content-Length

[timbtimbtimb]

Problem description

I am getting this error every 100 requests or so

ERROR:    Exception in ASGI application
Traceback (most recent call last):
  File "/usr/local/lib/python3.14/site-packages/starlette/_exception_handler.py", line 42, in wrapped_app
    await app(scope, receive, sender)
  File "/usr/local/lib/python3.14/site-packages/fastapi/routing.py", line 116, in app
    response = await f(request)
               ^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.14/site-packages/fastapi/routing.py", line 670, in app
    raw_response = await run_endpoint_function(
                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    ...<3 lines>...
    )
    ^
  File "/usr/local/lib/python3.14/site-packages/fastapi/routing.py", line 326, in run_endpoint_function
    return await run_in_threadpool(dependant.call, **values)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.14/site-packages/starlette/concurrency.py", line 32, in run_in_threadpool
    return await anyio.to_thread.run_sync(func)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.14/site-packages/anyio/to_thread.py", line 63, in run_sync
    return await get_async_backend().run_sync_in_worker_thread(
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
        func, args, abandon_on_cancel=abandon_on_cancel, limiter=limiter
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    )
    ^
  File "/usr/local/lib/python3.14/site-packages/anyio/_backends/_asyncio.py", line 2502, in run_sync_in_worker_thread
    return await future
           ^^^^^^^^^^^^
  File "/usr/local/lib/python3.14/site-packages/anyio/_backends/_asyncio.py", line 986, in run
    result = context.run(func, *args)
  File "/usr/local/lib/python3.14/site-packages/titiler/mosaic/factory.py", line 632, in tile
    image, assets = src_dst.tile(
                    ~~~~~~~~~~~~^
        x,
        ^^
    ...<8 lines>...
        **dataset_params.as_dict(),
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^
    )
    ^
  File "/usr/local/lib/python3.14/site-packages/rio_tiler/mosaic/backend.py", line 172, in tile
    img, asset_used = mosaic_reader(mosaic_assets, _reader, x, y, z, **kwargs)
                      ~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.14/site-packages/rio_tiler/mosaic/reader.py", line 151, in mosaic_reader
    raise EmptyMosaicError("Method returned an empty array")
rio_tiler.errors.EmptyMosaicError: Method returned an empty array

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/local/lib/python3.14/site-packages/uvicorn/protocols/http/h11_impl.py", line 410, in run_asgi
    result = await app(  # type: ignore[func-returns-value]
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
        self.scope, self.receive, self.send
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    )
    ^
  File "/usr/local/lib/python3.14/site-packages/uvicorn/middleware/proxy_headers.py", line 60, in __call__
    return await self.app(scope, receive, send)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.14/site-packages/fastapi/applications.py", line 1160, in __call__
    await super().__call__(scope, receive, send)
  File "/usr/local/lib/python3.14/site-packages/starlette/applications.py", line 107, in __call__
    await self.middleware_stack(scope, receive, send)
  File "/usr/local/lib/python3.14/site-packages/starlette/middleware/errors.py", line 186, in __call__
    raise exc
  File "/usr/local/lib/python3.14/site-packages/starlette/middleware/errors.py", line 164, in __call__
    await self.app(scope, receive, _send)
  File "/usr/local/lib/python3.14/site-packages/titiler/core/middleware.py", line 56, in __call__
    await self.app(scope, receive, send_wrapper)
  File "/usr/local/lib/python3.14/site-packages/starlette_cramjam/middleware.py", line 121, in __call__
    await responder(scope, receive, send)
  File "/usr/local/lib/python3.14/site-packages/starlette_cramjam/middleware.py", line 151, in __call__
    await self.app(scope, receive, self.send_with_compression)
  File "/usr/local/lib/python3.14/site-packages/starlette/middleware/cors.py", line 87, in __call__
    await self.app(scope, receive, send)
  File "/usr/local/lib/python3.14/site-packages/starlette/middleware/exceptions.py", line 63, in __call__
    await wrap_app_handling_exceptions(self.app, conn)(scope, receive, send)
  File "/usr/local/lib/python3.14/site-packages/starlette/_exception_handler.py", line 53, in wrapped_app
    raise exc
  File "/usr/local/lib/python3.14/site-packages/starlette/_exception_handler.py", line 42, in wrapped_app
    await app(scope, receive, sender)
  File "/usr/local/lib/python3.14/site-packages/fastapi/middleware/asyncexitstack.py", line 18, in __call__
    await self.app(scope, receive, send)
  File "/usr/local/lib/python3.14/site-packages/starlette/routing.py", line 716, in __call__
    await self.middleware_stack(scope, receive, send)
  File "/usr/local/lib/python3.14/site-packages/starlette/routing.py", line 736, in app
    await route.handle(scope, receive, send)
  File "/usr/local/lib/python3.14/site-packages/starlette/routing.py", line 290, in handle
    await self.app(scope, receive, send)
  File "/usr/local/lib/python3.14/site-packages/fastapi/routing.py", line 130, in app
    await wrap_app_handling_exceptions(app, request)(scope, receive, send)
  File "/usr/local/lib/python3.14/site-packages/starlette/_exception_handler.py", line 63, in wrapped_app
    await response(scope, receive, sender)
  File "/usr/local/lib/python3.14/site-packages/starlette/responses.py", line 164, in __call__
    await send({"type": prefix + "http.response.body", "body": self.body})
  File "/usr/local/lib/python3.14/site-packages/starlette/_exception_handler.py", line 39, in sender
    await send(message)
  File "/usr/local/lib/python3.14/site-packages/starlette/_exception_handler.py", line 39, in sender
    await send(message)
  File "/usr/local/lib/python3.14/site-packages/starlette_cramjam/middleware.py", line 188, in send_with_compression
    await self.send(message)
  File "/usr/local/lib/python3.14/site-packages/titiler/core/middleware.py", line 54, in send_wrapper
    await send(message)
  File "/usr/local/lib/python3.14/site-packages/starlette/middleware/errors.py", line 161, in _send
    await send(message)
  File "/usr/local/lib/python3.14/site-packages/uvicorn/protocols/http/h11_impl.py", line 507, in send
    output = self.conn.send(event=h11.Data(data=data))
  File "/usr/local/lib/python3.14/site-packages/h11/_connection.py", line 538, in send
    data_list = self.send_with_data_passthrough(event)
  File "/usr/local/lib/python3.14/site-packages/h11/_connection.py", line 571, in send_with_data_passthrough
    writer(event, data_list.append)
    ~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.14/site-packages/h11/_writers.py", line 65, in __call__
    self.send_data(event.data, write)
    ~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.14/site-packages/h11/_writers.py", line 91, in send_data
    raise LocalProtocolError("Too much data for declared Content-Length")
h11._util.LocalProtocolError: Too much data for declared Content-Length

Environment Information

  tiles_server:
    image: ghcr.io/developmentseed/titiler:latest
    container_name: tiles_server
    command: uvicorn titiler.application.main:app --host 0.0.0.0 --port 8000 --workers 17
    platform: linux/amd64
    ports:
      - "8000"
    volumes:
      - ${HOST_RASTERS_DIR}:/data/rasters
    restart: unless-stopped
    environment:
      - CPL_VSIL_CURL_ALLOWED_EXTENSIONS=.tif,.TIF,.tiff
      - GDAL_CACHEMAX=200
      - GDAL_DISABLE_READDIR_ON_OPEN=EMPTY_DIR
      - VSI_CACHE=TRUE
      - VSI_CACHE_SIZE=536870912

[vincentsarago]

Hi @timbtimbtimb

I'm not quite sure to understand, could you provide a minimal replicable example.

What I can see is:

• for one request you're getting

  File "/usr/local/lib/python3.14/site-packages/rio_tiler/mosaic/reader.py", line 151, in mosaic_reader
    raise EmptyMosaicError("Method returned an empty array")
rio_tiler.errors.EmptyMosaicError: Method returned an empty array

This error should be caught by the error handler

titiler/src/titiler/mosaic/titiler/mosaic/errors.py

Line 7 in fa16bcb

EmptyMosaicError: status.HTTP_204_NO_CONTENT,

and return a 204 response to your client.

• in

  titiler/src/titiler/core/titiler/core/errors.py

  Lines 57 to 58 in fa16bcb

  	if status_code == status.HTTP_204_NO_CONTENT:
  	return Response(content=None, status_code=204)

  we do make sure to return None content to avoid the message you're getting :-(

[vincentsarago]

@timbtimbtimb any update?