http: fix rawHeaders exceeding maxHeadersCount limit #2573

Job	Run time
Build slim tarball	1m 36s
aarch64-linux: with shared libraries	36m 45s
x86_64-linux: with shared libraries	49m 17s
x86_64-darwin: with shared libraries	57m 53s
aarch64-darwin: with shared libraries	2h 18m 22s
	4h 43m 53s

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