RFR: 8368695: Support 101 switching protocol in jdk.httpserver [v3]

[Michael McMahon]

On Fri, 10 Oct 2025 21:22:49 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`
>
> Josiah Noel has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Update UpgradeInputStream.java

Is the intention behind this to support websocket?

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

PR Comment: https://git.openjdk.org/jdk/pull/27751#issuecomment-3397996842