allow headers to be set from integration definition for HTTP integrat…

[jimmydurkin]

Motivation

Unlike the lambda integration, which allows headers to be set from the integration definition, the HTTP integration passes the invocation context headers directly to the backend without applying the headers from the integration. This change addresses #10034 and allows additional headers to be sent to the backend which matches our ability to do this in the AWS cloud.

Changes

Headers defined in an integration are now able to be sent along to the backend.

2024-01-09 10:03:04 {
2024-01-09 10:03:04     "type": "HTTP_PROXY",
2024-01-09 10:03:04     "httpMethod": "ANY",
2024-01-09 10:03:04     "uri": "http://api-proxy/{proxy}",
2024-01-09 10:03:04     "connectionType": "INTERNET",
2024-01-09 10:03:04     "requestParameters": {
2024-01-09 10:03:04         "integration.request.header.x-hello": "'hello'",
2024-01-09 10:03:04         "integration.request.path.proxy": "method.request.path.proxy"
2024-01-09 10:03:04     },
2024-01-09 10:03:04     "passthroughBehavior": "WHEN_NO_MATCH",
2024-01-09 10:03:04     "timeoutInMillis": 29000,
2024-01-09 10:03:04     "cacheNamespace": "q3jxp7vw3s",
2024-01-09 10:03:04     "cacheKeyParameters": []
2024-01-09 10:03:04 }
... print(headers)
2024-01-09 10:03:31 x-localstack-tgt-api: apigateway
2024-01-09 10:03:31 X-Forwarded-For: awslocal:4566
2024-01-09 10:03:31 x-localstack-edge: http://awslocal:4566
2024-01-09 10:03:31 x-hello: 'hello'
2024-01-09 10:03:31 

Testing

• I would love to add testing but am a bit new to python so am not sure where best to add it (e.g. what to mock and all that)

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[jimmydurkin]

I have read the CLA Document and I hereby sign the CLA

[calvernaz]

Hi @jimmydurkin, thanks for tackling this and providing the instructions to reproduce it. I'll review it and add a tests to it