RFR: 8368955: Improve HttpExchange.sendResponseHeaders usability [v2]

[Alan Bateman]

On Fri, 3 Oct 2025 05:00:50 GMT, Josiah Noel <duke at openjdk.org> wrote:

>> As specified in [JDK-8368955](https://bugs.openjdk.org/browse/JDK-8368955?jql=project%20in%20(JDK)%20AND%20component%20in%20(core-libs)%20AND%20Subcomponent%20in%20(java.net)), adds some constants to HttpExchange to make `sendResponseHeaders` more usable.
>
> Josiah Noel has updated the pull request incrementally with one additional commit since the last revision:
> 
>   pr comments

@SentryMan - I see JDK-8368955 is assigned @Michael-Mc-Mahon and it seems to working on it, did you check with them before creating this PR?

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PR Comment: https://git.openjdk.org/jdk/pull/27613#issuecomment-3364331836