http: be more generational GC friendly

[ywave620]

Avoid any potential ref to Buffer in new generation from old generation. Otherwise, the lightweight Minor GC could not collect Buffer, as a result, the heavy Major GC may be invoked more frequently

Similar tricks are used in Writable and Readable

node/lib/internal/streams/writable.js

Line 779 in ce6a628

buffered[i++] = null;

node/lib/internal/streams/readable.js

Line 1598 in ce6a628

buf[idx++] = null;

[nodejs-github-bot]

Review requested:

• @nodejs/http
• @nodejs/net

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.21%. Comparing base (7119303) to head (e906371).
Report is 15 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #56767      +/-   ##
==========================================
- Coverage   89.22%   89.21%   -0.01%     
==========================================
  Files         662      663       +1     
  Lines      192125   191976     -149     
  Branches    36972    36924      -48     
==========================================
- Hits       171421   171273     -148     
- Misses      13543    13566      +23     
+ Partials     7161     7137      -24     

Files with missing lines	Coverage Δ
lib/_http_outgoing.js	95.24% <100.00%> (+<0.01%)	⬆️

... and 57 files with indirect coverage changes

[mcollina]

tests are failing

[legendecas]

Failed tests should be fixed by #56768. But the linter complaints shall be addressed.

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/64764/

[ywave620]

@legendecas CI is green, please take a look