RFR: 8358942: HttpClient adds Content-Length: 0 for a GET request with a BodyPublishers.noBody() [v4]

[Daniel Jeliński]

> Do not send the Content-Length header on HTTP/1.1 requests when the content length is known to be zero and the method does not expect content or is unknown.
> 
> This brings the HTTP/1.1 implementation in line with the recommendations from RFC 9110.
> 
> The existing ContentLengthHeaderTest was extended to cover the modified scenarios.
> 
> Tier1-3 tests continue to pass.

Daniel Jeliński has updated the pull request incrementally with one additional commit since the last revision:

  More strict verification of content-length handling

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/27727/files
  - new: https://git.openjdk.org/jdk/pull/27727/files/da849bf5..76dc259d

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=27727&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=27727&range=02-03

  Stats: 40 lines in 1 file changed: 7 ins; 29 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/27727.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27727/head:pull/27727

PR: https://git.openjdk.org/jdk/pull/27727