fix(http2): allow GET and HEAD request bodies over h2

[trivikr]

This relates to...

Fixes: #5057

Rationale

HTTP/2 requests with a body on GET and HEAD currently fail with ERR_STREAM_WRITE_AFTER_END.

Changes

• Change the HTTP/2 endStream decision to depend on whether the normalized request body is null, instead of special-casing GET and HEAD.
• Add a regression test in test/http2-body.js covering HTTP/2 GET and HEAD requests with bodies.
• Verify that both request bodies are delivered to the server and that the responses complete successfully.

Features

N/A

Bug Fixes

Fix ERR_STREAM_WRITE_AFTER_END for HTTP/2 GET and HEAD requests with a body

Breaking Changes and Deprecations

N/A

Status

• I have read and agreed to the Developer's Certificate of Origin
• Tested
• Benchmarked (optional)
• Documented
• Review ready
• In review
• Merge ready

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.10%. Comparing base (ec60a7c) to head (a80a688).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5058   +/-   ##
=======================================
  Coverage   93.10%   93.10%           
=======================================
  Files         110      110           
  Lines       35807    35807           
=======================================
  Hits        33339    33339           
  Misses       2468     2468           

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[mcollina]

lgtm

[mcollina]

Cana you verify if those are allowed in http1?