[jdk17u-dev] RFR: 8304963: HttpServer closes connection after processing HEAD after JDK-7026262

[Christoph Langer]

Hi all,

This pull request contains a backport of [JDK-8304963](https://bugs.openjdk.org/browse/JDK-8304963), commit [3c4cd50e](https://github.com/openjdk/jdk/commit/3c4cd50e3cef5905d6c5dacddd6759e118bc50ca) from the [openjdk/jdk](https://git.openjdk.org/jdk) repository.

The commit being backported was authored by Daniel Jeliński on 28 Mar 2023 and was reviewed by Daniel Fuchs.

Thanks!

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Commit messages:
 - Backport 3c4cd50e3cef5905d6c5dacddd6759e118bc50ca

Changes: https://git.openjdk.org/jdk17u-dev/pull/2783/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=2783&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8304963
  Stats: 129 lines in 2 files changed: 129 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/2783.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/2783/head:pull/2783

PR: https://git.openjdk.org/jdk17u-dev/pull/2783