Use lenient headers for response parser (#7490)

[Dreamsorcerer]

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
(cherry picked from commit 6396531)

[codecov]

Codecov Report

Merging #7491 (97bc46f) into 3.9 (5a5f65a) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##              3.9    #7491      +/-   ##
==========================================
+ Coverage   97.28%   97.29%   +0.01%     
==========================================
  Files         107      107              
  Lines       31618    31628      +10     
  Branches     3658     3661       +3     
==========================================
+ Hits        30759    30773      +14     
+ Misses        653      651       -2     
+ Partials      206      204       -2     

Flag	Coverage Δ
CI-GHA	97.24% <100.00%> (+0.01%)	⬆️
OS-Linux	96.92% <100.00%> (+0.01%)	⬆️
OS-Windows	94.53% <100.00%> (+<0.01%)	⬆️
OS-macOS	96.60% <100.00%> (+0.01%)	⬆️
Py-3.10.11	94.45% <100.00%> (+<0.01%)	⬆️
Py-3.10.12	96.79% <100.00%> (+0.01%)	⬆️
Py-3.11.4	96.50% <70.00%> (+<0.01%)	⬆️
Py-3.8.10	94.42% <100.00%> (+<0.01%)	⬆️
Py-3.8.17	96.74% <100.00%> (+0.01%)	⬆️
Py-3.9.13	94.43% <100.00%> (+<0.01%)	⬆️
Py-3.9.17	96.77% <100.00%> (+0.01%)	⬆️
Py-pypy7.3.11	96.29% <70.00%> (+<0.01%)	⬆️
VM-macos	96.60% <100.00%> (+0.01%)	⬆️
VM-ubuntu	96.92% <100.00%> (+0.01%)	⬆️
VM-windows	94.53% <100.00%> (+<0.01%)	⬆️

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Files Changed	Coverage Δ
tests/test_http_parser.py	99.10% <100.00%> (+0.01%)	⬆️

... and 2 files with indirect coverage changes

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