[PR #11017/1c01726 backport][3.12] Support Reusable Request Bodies and Improve Payload Handling

[bdraco]

(cherry picked from commit 1c01726)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.23%. Comparing base (2e55462) to head (f1d9381).
⚠️ Report is 109 commits behind head on 3.12.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             3.12   #11018      +/-   ##
==========================================
+ Coverage   98.18%   98.23%   +0.04%     
==========================================
  Files         130      130              
  Lines       40277    41508    +1231     
  Branches     2259     2281      +22     
==========================================
+ Hits        39547    40774    +1227     
- Misses        557      560       +3     
- Partials      173      174       +1     

Flag	Coverage Δ
CI-GHA	98.12% <100.00%> (+0.04%)	⬆️
OS-Linux	97.85% <100.00%> (+0.04%)	⬆️
OS-Windows	95.46% <100.00%> (+0.13%)	⬆️
OS-macOS	97.07% <100.00%> (+0.08%)	⬆️
Py-3.10.11	96.96% <100.00%> (+0.08%)	⬆️
Py-3.10.17	97.47% <100.00%> (+0.06%)	⬆️
Py-3.11.12	97.56% <99.92%> (+0.06%)	⬆️
Py-3.11.9	97.06% <99.92%> (+0.08%)	⬆️
Py-3.12.10	97.91% <100.00%> (+0.05%)	⬆️
Py-3.13.3	97.90% <100.00%> (+0.04%)	⬆️
Py-3.9.13	96.84% <99.92%> (+0.08%)	⬆️
Py-3.9.22	97.36% <99.92%> (+0.09%)	⬆️
Py-pypy7.3.16	87.05% <99.62%> (-2.33%)	⬇️
VM-macos	97.07% <100.00%> (+0.08%)	⬆️
VM-ubuntu	97.85% <100.00%> (+0.04%)	⬆️
VM-windows	95.46% <100.00%> (+0.13%)	⬆️

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[codspeed-hq]

CodSpeed Performance Report

Merging #11018 will not alter performance

_{Comparing patchback/backports/3.12/1c0172666f26e11e99850198154336390fdacb09/pr-11017 (f1d9381) with 3.12 (2e55462)}

Summary

✅ 59 untouched benchmarks