[PR #11017/1c01726 backport][3.13] 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.
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✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             3.13   #11019   +/-   ##
=======================================
  Coverage        ?   98.23%           
=======================================
  Files           ?      130           
  Lines           ?    41508           
  Branches        ?     2281           
=======================================
  Hits            ?    40776           
  Misses          ?      557           
  Partials        ?      175           

Flag	Coverage Δ
CI-GHA	98.12% <100.00%> (?)
OS-Linux	97.87% <100.00%> (?)
OS-Windows	95.45% <100.00%> (?)
OS-macOS	97.07% <100.00%> (?)
Py-3.10.11	96.95% <100.00%> (?)
Py-3.10.17	97.48% <100.00%> (?)
Py-3.11.12	97.57% <99.92%> (?)
Py-3.11.9	97.05% <99.92%> (?)
Py-3.12.10	97.92% <100.00%> (?)
Py-3.13.3	97.91% <100.00%> (?)
Py-3.9.13	96.84% <99.92%> (?)
Py-3.9.22	97.36% <99.92%> (?)
Py-pypy7.3.16	87.65% <100.00%> (?)
VM-macos	97.07% <100.00%> (?)
VM-ubuntu	97.87% <100.00%> (?)
VM-windows	95.45% <100.00%> (?)

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[codspeed-hq]

CodSpeed Performance Report

Merging #11019 will not alter performance

_{Comparing patchback/backports/3.13/1c0172666f26e11e99850198154336390fdacb09/pr-11017 (dc0cb55) with 3.13 (a5f321d)}

Summary

✅ 59 untouched benchmarks