Support API Gateway websocket api via LambdaServer

[wiowou]

Issue #, if available:

Description of changes:
Added a websocket option to the Amazon.Lambda.AspNetCoreServer project so that API Gateway websocket api's can also use the LambdaServer (DI, controllers, etc) given the user does the following:

1. References the same lambda to handle the RouteKeys in API Gateway for which they have controller routes set up.
2. Sets up controller routes as POST with path=RouteKey

Unit tests are passing.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[bhoradc]

Hi @wiowou,

Thank you for contributing the PR. Our team will review it and get back to you as soon we can.

Regards,
Chaitanya

[wiowou]

Thank you, @bhoradc !

-Behram

[Copilot]

Pull request overview

Note

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Adds support for API Gateway WebSocket API events to be processed through Amazon.Lambda.AspNetCoreServer so WebSocket RouteKeys can be routed into ASP.NET Core controllers / DI via LambdaServer.

Changes:

• Introduces APIGatewayWebsocketApiProxyFunction (and typed TStartup variant) to translate WebSocket events into ASP.NET Core requests (POST + path from RouteKey).
• Refactors APIGatewayProxyFunction to allow overriding HTTP path/method/header derivation and adds ConnectionId propagation.
• Adds a test web app controller + request fixture + unit test validating routing/serialization behavior.

Reviewed changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 7 comments.

Show a summary per file

File	Description
Libraries/test/TestWebApp/WebsocketApiLambdaFunction.cs	Adds a test Lambda entrypoint using the new WebSocket proxy base class.
Libraries/test/TestWebApp/Controllers/RouteKeyController.cs	Adds a controller route simulating API Gateway RouteKey routing via POST.
Libraries/test/Amazon.Lambda.AspNetCoreServer.Test/values-post-withbody-websocketapi-request.json	Adds a sample WebSocket event payload fixture for tests.
Libraries/test/Amazon.Lambda.AspNetCoreServer.Test/TestApiGatewayWebsocketApiCalls.cs	Adds a unit test invoking the WebSocket proxy function end-to-end.
Libraries/test/Amazon.Lambda.AspNetCoreServer.Test/Amazon.Lambda.AspNetCoreServer.Test.sln	Adds a solution file for the test project.
Libraries/src/Amazon.Lambda.AspNetCoreServer/APIGatewayWebsocketApiProxyFunction{TStartup}.cs	Adds the typed Startup variant for WebSocket proxy functions.
Libraries/src/Amazon.Lambda.AspNetCoreServer/APIGatewayWebsocketApiProxyFunction.cs	Adds the WebSocket proxy implementation (path/method/headers).
Libraries/src/Amazon.Lambda.AspNetCoreServer/APIGatewayProxyFunction.cs	Refactors request marshalling to use overridable parsing hooks; propagates ConnectionId.
Libraries/src/Amazon.Lambda.AspNetCoreServer.Hosting/ServiceCollectionExtensions.cs	Adds new LambdaEventSource.WebsocketApi wiring to runtime server selection.
Libraries/src/Amazon.Lambda.AspNetCoreServer.Hosting/Internal/LambdaRuntimeSupportServer.cs	Adds runtime support server for WebSocket API Minimal API hosting.

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[GarrettBeatty]

hi thanks for the pr. can you rebase it on top of dev branch and change the target branch to dev please?