> Currently `HttpClient` will timeout if a server doesn't respond to a request 
> which includes `Expect: 100-Continue`
> 
> Section 10.1.1 of [rfc 
> 9110](https://datatracker.ietf.org/doc/html/rfc9110#name-expect) states that
> 
> a client SHOULD NOT wait for an indefinite period before sending the content.
> 
> 
> 
> This PR changes `HttpClient` to wait for a maximum of 5 seconds for a server 
> response, this will be shorter if a timeout is set. If no response is 
> received, the message will be sent regardless. 
> This should bring `HttpClient` in line with how 
> [HttpUrlConnection](https://github.com/DarraghClarke/jdk/blob/61386c199a3b29457c002ad31a23990b7f6f88fd/src/java.base/share/classes/sun/net/www/protocol/http/HttpURLConnection.java#L1305)
>  treats expect continue timeouts.
> 
> This is done using `orTimeout` in the `expectContinue` method , though there 
> is some changes in `streams.java` where it was possible for race conditions 
> to cause timeouts where `CompleteableFuture`s were removed from 
> `response_cfs` prematurely or in some cases not removed at all.
> 
> I've tested this against tiers 1-3 and it appears to be stable.

Darragh Clarke has updated the pull request with a new target base due to a 
merge or a rebase. The pull request now contains five commits:

 - Implemented feedback and cleanup
 - Merge master
 - remove duplicate method
 - implemented feedback
 - Add timeout handling to expect-continue implementation

-------------

Changes: https://git.openjdk.org/jdk/pull/20525/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=20525&range=03
  Stats: 109 lines in 4 files changed: 70 ins; 0 del; 39 mod
  Patch: https://git.openjdk.org/jdk/pull/20525.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/20525/head:pull/20525

PR: https://git.openjdk.org/jdk/pull/20525

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