[PR #7366/1a48add0 backport][3.9] Improve error messages from C parser

[patchback]

This is a backport of PR #7366 as merged into master (1a48add).

This adds information to the error messages to show what causes the error.

Exception output looks like:

aiohttp.http_exceptions.BadHttpMessage: 400, message:
  Invalid header value char:

    b'Set-Cookie: abc\x01def\r'
                     ^

[codecov]

Codecov Report

Merging #7379 (d80a4ef) into 3.9 (e7fe416) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##              3.9    #7379   +/-   ##
=======================================
  Coverage   97.27%   97.27%           
=======================================
  Files         107      107           
  Lines       31593    31605   +12     
  Branches     4011     4013    +2     
=======================================
+ Hits        30733    30745   +12     
  Misses        653      653           
  Partials      207      207           

Flag	Coverage Δ
CI-GHA	97.22% <100.00%> (+<0.01%)	⬆️
OS-Linux	96.90% <100.00%> (+<0.01%)	⬆️
OS-Windows	94.52% <100.00%> (+<0.01%)	⬆️
OS-macOS	96.58% <100.00%> (+<0.01%)	⬆️
Py-3.10.11	94.43% <100.00%> (+<0.01%)	⬆️
Py-3.10.12	96.78% <100.00%> (+<0.01%)	⬆️
Py-3.11.0	96.50% <81.48%> (-0.02%)	⬇️
Py-3.8.10	94.41% <100.00%> (+<0.01%)	⬆️
Py-3.8.17	96.72% <100.00%> (+<0.01%)	⬆️
Py-3.9.13	94.42% <100.00%> (+<0.01%)	⬆️
Py-3.9.17	96.76% <100.00%> (+<0.01%)	⬆️
Py-pypy7.3.11	94.12% <77.77%> (-0.02%)	⬇️
VM-macos	96.58% <100.00%> (+<0.01%)	⬆️
VM-ubuntu	96.90% <100.00%> (+<0.01%)	⬆️
VM-windows	94.52% <100.00%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
aiohttp/http_exceptions.py	100.00% <100.00%> (ø)
tests/test_http_exceptions.py	100.00% <100.00%> (ø)
tests/test_http_parser.py	99.09% <100.00%> (+<0.01%)	⬆️

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