8208693: HttpClient: Extend the request timeout's scope to cover the response body

[vy]

Currently HttpRequest::timeout only applies until the response headers are received. Extend its scope to also cover the consumption of the response body.

Review guidelines

1. Read "the fix" in MultiExchange
2. Skim through the test server handler in TimeoutResponseTestSupport
3. Review first TimeoutResponseHeaderTest, and then TimeoutResponseBodyTest (Mind the multiple @test blocks!)

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Progress

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• Commit message must refer to an issue

Issue

• JDK-8208693: HttpClient: Extend the request timeout's scope to cover the response body (Bug - P3)

Reviewing

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[vy]

Without this, server handler's exchange.resetStream(Http3Error.H3_REQUEST_REJECTED.code()) results in client to fail the request, instead of retrying it. I am not sure if H3_REQUEST_REJECTED is the only error code we should guard against.

[vy]

Figured the problem is more convoluted than it appears. @jaikiran will soon land a PR adressing this issue. I will hold this PR until then.

[kwin]

@vy Thanks a lot for driving this. I think also the javadoc of the request timeout should be clarified with what timeframe exactly it refers to.