fix(server): start header read timeout immediately #2718

Job	Run time
Verify hyper.h is up to date	20s
Check Style	17s
semver	16s
Check MSRV	55s
Test C API (FFI)	34s
features	30s
minimal-versions	55s
Test with Miri	1m 53s
udeps	21s
unexpected-cfgs	15s
Test stable on ubuntu-latest	1m 19s
Test stable on windows-latest	2m 44s
Test stable on macOS-latest	1m 25s
Test beta on ubuntu-latest	1m 15s
Test beta on windows-latest	2m 23s
Test beta on macOS-latest	1m 40s
Test nightly on ubuntu-latest	1m 19s
Test nightly on windows-latest	2m 45s
Test nightly on macOS-latest	1m 34s
Check exposed types	21s
Build docs	24s
CI is green	1s
	23m 26s

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