RFR: 8208693: HttpClient: Extend the request timeout's scope to cover the response body [v9]

[Volkan Yazici]

On Wed, 5 Nov 2025 10:29:22 GMT, Volkan Yazici <vyazici at openjdk.org> wrote:

>> 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!)
>
> Volkan Yazici has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Cancel timer on 204

src/java.net.http/share/classes/jdk/internal/net/http/MultiExchange.java line 391:

> 389:             // Ensure that the connection is closed or returned to the pool
> 390:             exch.nullBody(response, throwable);
> 391:         });

@dfuch, I've introduced this improvement against 204s, which you internally tipped me, in 480349b672e. Though I could not come up with a way to decently test this. Any suggestions?

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PR Review Comment: https://git.openjdk.org/jdk/pull/27469#discussion_r2493900320