Improve client performance when there are no auto headers to skip #8757

Job	Run time
Generate llhttp sources	6s
Linter	1m 13s
Benchmark	4m 24s
Test (3.9, ubuntu, false)	3m 42s
Test (3.9, macos, false)	2m 53s
Test (3.9, windows, false)	4m 19s
Test (3.9, Y, ubuntu, false)	4m 8s
Test (3.10, ubuntu, false)	3m 31s
Test (3.10, macos, false)	3m 14s
Test (3.10, windows, false)	4m 17s
Test (3.10, Y, ubuntu, false)	4m 41s
Test (3.11, ubuntu, false)	3m 34s
Test (3.11, macos, false)	3m 46s
Test (3.11, windows, false)	4m 30s
Test (3.11, Y, ubuntu, false)	3m 54s
Test (3.12, ubuntu, false)	4m 3s
Test (3.12, macos, false)	3m 8s
Test (3.12, windows, false)	4m 34s
Test (3.12, Y, ubuntu, false)	4m 26s
Test (3.13, ubuntu, false)	4m 11s
Test (3.13, macos, false)	3m 4s
Test (3.13, windows, false)	5m 19s
Test (3.13, Y, ubuntu, false)	4m 23s
Test (pypy-3.9, Y, ubuntu, false)	7m 16s
check	2s
Pre-Deploy	0s
Build wheels on ${{ matrix.os }} ${{ matrix.qemu }}	0s
Tarball	0s
Deploy	0s
	1h 32m 38s

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