RFR: 8358942: HttpClient adds Content-Length: 0 for a GET request with a BodyPublishers.noBody() [v3]

[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:

  Check that content-length is sent on POST/PUT with empty body

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Changes:
  - all: https://git.openjdk.org/jdk/pull/27727/files
  - new: https://git.openjdk.org/jdk/pull/27727/files/fc6a7edb..da849bf5

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=27727&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=27727&range=01-02

  Stats: 6 lines in 1 file changed: 6 ins; 0 del; 0 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