Withdrawn: 8368695: Support 101 switching protocol in jdk.httpserver

[Josiah Noel]

On Fri, 10 Oct 2025 19:45:57 GMT, Josiah Noel <duke at openjdk.org> wrote:

> - adds a flag to ExchangeImpl to signal whether the current request is an Upgrade request
> - Adds a new `UpgradeInputStream` to ensure that the server keeps track of when the upgraded request is closed
> - on 101 response codes, `sendResponseHeaders` will not immediately close the output stream 
> - on 101 response codes, `sendResponseHeaders` will use an `UndefLengthOutputStream`

This pull request has been closed without being integrated.

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PR: https://git.openjdk.org/jdk/pull/27751