Using Localstack PRO with Serverless Framework, every other HTTP call to a GET endpoint results in a 502 Bad Gateway with the following error logged:

2020-03-26T13:52:59:ERROR:localstack.services.generic_proxy: Error forwarding request: 'NoneType' object has no attribute 'headers' Traceback (most recent call last):
File "/opt/code/localstack/localstack/services/generic_proxy.py", line 247, in forward
listener_result = listener.forward_request(method=method,
File "/opt/code/localstack/.venv/lib/python3.8/site-packages/localstack_ext/services/apigateway/apigateway_extended.py", line 64, in forward_request
AttributeError: 'NoneType' object has no attribute 'headers'

This seems like it may be related to #2064

Just to reiterate, the error only occurs every other call starting with the second call. Also, switching to the community edition eliminates the problem.

Serverless.yml:

service: HelloWorld

plugins:
  - serverless-localstack

custom:
  localstack:
    host: http://localhost
    stages:
      - local
  stages:
    - local
    - prod

provider:
  name: aws
  runtime: dotnetcore2.1
  region: us-east-1
  stage: ${opt:stage, 'local'}

package:
  individually: true

functions:
  hello:
    handler: CsharpHandlers::AwsDotnetCsharp.Handler::HelloWorldAsync
    package:
      artifact: artifact/helloworld-lambda-csharp.zip
    events:
    - http:
        path: helloworld
        method: GET
        cors: true