httpx.RemoteProtocolError: Server disconnected without sending a response

## Current Behavior
While performing concurrent ingestion using the Qdrant Python client (HTTP mode, httpx==0.27.2), I consistently encounter the following error:

`httpx.RemoteProtocolError: Server disconnected without sending a response
`

This happens even with very small batch sizes (15 points) and a semaphore-limited maximum of 5 concurrent ingestion threads.

## Steps to Reproduce


1. Using Qdrant in Docker (`image:v1.13.4`)
2. Ingesting ~15 points per batch using `qdrant_client.upsert(...)`

Ingestion function is attached below:

 ```
 ` # Prepare points for embeddings based on mode
              for i, doc in enumerate(documents):
                  # Create point structure with common fields
                  point = PointStruct(
                      id=str(uuid.uuid4()),
                      vector={
                          dense_vector_name: dense_embeddings[i],
                          sparse_vector_name: sparse_embeddings[i],
                      },
                      payload={
                          "page_content": doc.page_content,
                          "metadata": doc.metadata
                      }
                  )
                  points.append(point)
                  
              logger.debug(f"Size of points to be stored in collection {collection_name} is {len(points)}")
              # Upload all embeddings at once
              if semaphore:
                  with semaphore:
                      self.qdrant_client.upsert(
                          collection_name=collection_name,
                          points=points,
                          wait=False
                      )
              else:
                  self.qdrant_client.upsert(
                      collection_name=collection_name,
                      points=points,
                      wait=False
                  )
              logger.info(f"Successfully added {len(documents)} splits to the collection {collection_name} in the qdrant vector database.")`
```

3. Both dense and sparse vectors are used per point
4. Upsert is called inside a function wrapped in a `Semaphore(5)` (tried 3 also) to limit concurrency. I have also tried it without `semaphore` but issue persists.

5. ` wait=False `or `wait=True` both tested — issue persists

6. HTTP client is` httpx==0.27.2`





## Expected Behavior

Qdrant should either:

Respond with an error (e.g., 503 Service Unavailable, memory limit exceeded), or

Continue to handle small batch ingestion under moderate concurrency without dropping connections unexpectedly

## Possible Solution



## Context (Environment)


Qdrant version: latest (Docker image)

Qdrant client version: `qdrant-client==1.8.0
`
`httpx version: 0.27.2
`
`Python: 3.11`

Platform: Ubuntu 22.04, running in AWS EC2

Running inside Docker: Yes

Number of parallel ingestion threads: 5 (semaphore-limited)

Batch size: 15 points

Each point includes: dense (768d) + sparse embeddings + metadata




## Detailed Description

The ingestion runs successfully for a number of batches, then randomly fails with:
```
ERROR - Traceback (most recent call last):
  File "/home/ubuntu/miniconda3/envs/new_cdr/lib/python3.11/site-packages/httpx/_transports/default.py", line 72, in map_httpcore_exceptions
    yield
  File "/home/ubuntu/miniconda3/envs/new_cdr/lib/python3.11/site-packages/httpx/_transports/default.py", line 236, in handle_request
    resp = self._pool.handle_request(req)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/ubuntu/miniconda3/envs/new_cdr/lib/python3.11/site-packages/httpcore/_sync/connection_pool.py", line 256, in handle_request
    raise exc from None
  File "/home/ubuntu/miniconda3/envs/new_cdr/lib/python3.11/site-packages/httpcore/_sync/connection_pool.py", line 236, in handle_request
    response = connection.handle_request(
               ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/ubuntu/miniconda3/envs/new_cdr/lib/python3.11/site-packages/httpcore/_sync/connection.py", line 103, in handle_request
    return self._connection.handle_request(request)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/ubuntu/miniconda3/envs/new_cdr/lib/python3.11/site-packages/httpcore/_sync/http11.py", line 136, in handle_request
    raise exc
  File "/home/ubuntu/miniconda3/envs/new_cdr/lib/python3.11/site-packages/httpcore/_sync/http11.py", line 106, in handle_request
    ) = self._receive_response_headers(**kwargs)
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/ubuntu/miniconda3/envs/new_cdr/lib/python3.11/site-packages/httpcore/_sync/http11.py", line 177, in _receive_response_headers
    event = self._receive_event(timeout=timeout)
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/ubuntu/miniconda3/envs/new_cdr/lib/python3.11/site-packages/httpcore/_sync/http11.py", line 231, in _receive_event
    raise RemoteProtocolError(msg)
httpcore.RemoteProtocolError: Server disconnected without sending a response.

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/home/ubuntu/miniconda3/envs/new_cdr/lib/python3.11/site-packages/qdrant_client/http/api_client.py", line 116, in send_inner
    response = self._client.send(request)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/ubuntu/miniconda3/envs/new_cdr/lib/python3.11/site-packages/httpx/_client.py", line 926, in send
    response = self._send_handling_auth(
               ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/ubuntu/miniconda3/envs/new_cdr/lib/python3.11/site-packages/httpx/_client.py", line 954, in _send_handling_auth
    response = self._send_handling_redirects(
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/ubuntu/miniconda3/envs/new_cdr/lib/python3.11/site-packages/httpx/_client.py", line 991, in _send_handling_redirects
    response = self._send_single_request(request)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/ubuntu/miniconda3/envs/new_cdr/lib/python3.11/site-packages/httpx/_client.py", line 1027, in _send_single_request
    response = transport.handle_request(request)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/ubuntu/miniconda3/envs/new_cdr/lib/python3.11/site-packages/httpx/_transports/default.py", line 235, in handle_request
    with map_httpcore_exceptions():
  File "/home/ubuntu/miniconda3/envs/new_cdr/lib/python3.11/contextlib.py", line 158, in __exit__
    self.gen.throw(typ, value, traceback)
  File "/home/ubuntu/miniconda3/envs/new_cdr/lib/python3.11/site-packages/httpx/_transports/default.py", line 89, in map_httpcore_exceptions
    raise mapped_exc(message) from exc
httpx.RemoteProtocolError: Server disconnected without sending a response.

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/ubuntu/actransit-cdr/corporate-data-repository/app/vectorization/vector_store/qdrant_vector_store.py", line 165, in create_vector_store
    self.qdrant_client.upsert(
  File "/home/ubuntu/miniconda3/envs/new_cdr/lib/python3.11/site-packages/qdrant_client/qdrant_client.py", line 1567, in upsert
    return self._client.upsert(
           ^^^^^^^^^^^^^^^^^^^^
  File "/home/ubuntu/miniconda3/envs/new_cdr/lib/python3.11/site-packages/qdrant_client/qdrant_remote.py", line 1908, in upsert
    http_result = self.openapi_client.points_api.upsert_points(
                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/ubuntu/miniconda3/envs/new_cdr/lib/python3.11/site-packages/qdrant_client/http/api/points_api.py", line 987, in upsert_points
    return self._build_for_upsert_points(
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/ubuntu/miniconda3/envs/new_cdr/lib/python3.11/site-packages/qdrant_client/http/api/points_api.py", line 512, in _build_for_upsert_points
    return self.api_client.request(
           ^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/ubuntu/miniconda3/envs/new_cdr/lib/python3.11/site-packages/qdrant_client/http/api_client.py", line 89, in request
    return self.send(request, type_)
           ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/ubuntu/miniconda3/envs/new_cdr/lib/python3.11/site-packages/qdrant_client/http/api_client.py", line 106, in send
    response = self.middleware(request, self.send_inner)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/ubuntu/miniconda3/envs/new_cdr/lib/python3.11/site-packages/qdrant_client/http/api_client.py", line 215, in __call__
    return call_next(request)
           ^^^^^^^^^^^^^^^^^^
  File "/home/ubuntu/miniconda3/envs/new_cdr/lib/python3.11/site-packages/qdrant_client/http/api_client.py", line 118, in send_inner
    raise ResponseHandlingException(e)
qdrant_client.http.exceptions.ResponseHandlingException: Server disconnected without sending a response.
```
## Possible Implementation

Provide feedback

Saved searches

Use saved searches to filter your results more quickly

httpx.RemoteProtocolError: Server disconnected without sending a response #6481

Current Behavior

Steps to Reproduce

Expected Behavior

Possible Solution

Context (Environment)

Detailed Description

Possible Implementation

Metadata

Assignees

Labels

Type

Fields

Projects

Milestone

Relationships

Development

httpx.RemoteProtocolError: Server disconnected without sending a response #6481

Description

Current Behavior

Steps to Reproduce

Expected Behavior

Possible Solution

Context (Environment)

Detailed Description

Possible Implementation

Metadata

Metadata

Assignees

Labels

Type

Fields

Projects

Milestone

Relationships

Development

Issue actions