Ensure `HttpServer` doesn't close connection after zero-length requests. --------- - [X] I confirm that I make this contribution in accordance with the [OpenJDK Interim AI Policy](https://openjdk.org/legal/ai).
------------- Commit messages: - Fix the `eof` handling in `FixedLengthInputStream` Changes: https://git.openjdk.org/jdk/pull/32234/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=32234&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8387853 Stats: 211 lines in 2 files changed: 210 ins; 0 del; 1 mod Patch: https://git.openjdk.org/jdk/pull/32234.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/32234/head:pull/32234 PR: https://git.openjdk.org/jdk/pull/32234
