http: fix rawHeaders exceeding maxHeadersCount limit #2074

Job	Run time
Build slim tarball	1m 30s
aarch64-linux: with shared libraries	2h 22m 57s
aarch64-darwin: with shared libraries	3h 16m 41s
x86_64-darwin: with shared libraries	2h 27m 1s
x86_64-linux: with shared libraries	2h 30m 36s
	10h 38m 45s

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