bug: connection to ApiGatewayv2 WebSocket always receive close message #13198
Description
Is there an existing issue for this?
- I have searched the existing issues
Current Behavior
Once created an apigatewayv2 with WebSocket protocol, using whatever websocket client to connect to it, attempting to connect to is impossible due to the following error printed by the locastack-pro container:
aws-1 | 2025-09-26T08:01:43.071 INFO --- [-functhread5] websockets.server : connection open
aws-1 | 2025-09-26T08:01:43.077 INFO --- [functhread14] localstack.utils.threads : Thread run method <function AdaptiveThreadPool.submit.<locals>._run at 0x7f0df42668e0>(None) failed: 'ApiGatewayManagementApiBackend' object has no attribute 'apis' Traceback (most recent call last):
aws-1 | File "/opt/code/localstack/.venv/lib/python3.11/site-packages/localstack/utils/threads.py", line 60, in run
aws-1 | result = self.func(self.params, **kwargs)
aws-1 | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
aws-1 | File "/opt/code/localstack/.venv/lib/python3.11/site-packages/localstack/utils/asyncio.py", line 51, in _run
aws-1 | return fn(*args, **kwargs)
aws-1 | ^^^^^^^^^^^^^^^^^^^
aws-1 | File "/opt/code/localstack/.venv/lib/python3.11/site-packages/localstack/pro/core/services/apigatewayv2/next_gen/execute_api/websockets_legacy/websocket_async_handler.py.enc", line 42, in A
aws-1 | if not d:LOG.debug('Authorization denied when accessing WebSocket API "%s": %s',L,W.content);raise DeniedAuthorization(W.content)
aws-1 | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
aws-1 | localstack.pro.core.services.apigateway.legacy.authorizers.DeniedAuthorization: 'ApiGatewayManagementApiBackend' object has no attribute 'apis'
aws-1 |
aws-1 | 2025-09-26T08:01:45.927 INFO --- [-functhread5] websockets.server : connection closedI don't know if it can be related but whenever I go to the page of apigateway of the localstack console it logs the following error
aws-1 | 2025-09-26T08:01:31.643 INFO --- [et.reactor-1] localstack.request.aws : AWS apigateway.GetRestApis => 501 (InternalFailure)
aws-1 | 2025-09-26T08:01:31.928 INFO --- [et.reactor-0] localstack.aws.skeleton : No moto route for service apigateway on path /restapis found.Expected Behavior
It should connect to the websocket client.
How are you starting LocalStack?
With a docker-compose file
Steps To Reproduce
How are you starting localstack
services:
aws:
image: localstack/localstack-pro:4.8.1
ports:
- "4566:4566" # LocalStack Gateway
- "4510:4510"
environment:
- DEBUG=${DEBUG:-0}
- AWS_DEFAULT_REGION=us-east-1
- AWS_REGION=us-east-1
- AWS_ACCESS_KEY_ID=test
- AWS_SECRET_ACCESS_KEY=test
- LOCALSTACK_AUTH_TOKEN=***
- PERSISTENCE=1
volumes:
- "${HOST_WORKSPACE_DIR}:/home/localstack"
- "${LOCALSTACK_VOLUME_DIR:-./volume}:/var/lib/localstack"
- "/var/run/docker.sock:/var/run/docker.sock"
networks:
default:
external: true
name: ${WORKSPACE_NETWORK_NAME}docker compose up
Client commands
awslocal apigatewayv2 create-api
--name "realtime"
--protocol-type WEBSOCKET
--route-selection-expression '$request.body.action'
--query 'ApiId'
--output text
websocat -v ws://localhost:4510
Environment
- OS: ArchLinux
- LocalStack:
LocalStack version: 4.8.1 (but received the same error with 4.6.0 and 4.7.0)
LocalStack Docker image sha:
LocalStack build date: 2025-09-16
LocalStack build git hash: 7aa409536Anything else?
No response