Utilize `HeaderName` for non-sensitive headers #2345

Job	Run time
Docs	20s
Lint	18s
build_versions (stable)	19s
Test	1m 0s
build_versions (beta)	20s
cargo-deny (aarch64-apple-ios)	21s
Test (charset)	37s
Test	26s
cargo-deny (aarch64-linux-android)	19s
Test (charset)	27s
cargo-deny (i686-pc-windows-gnu)	18s
Test (cookies)	41s
cargo-deny (i686-pc-windows-msvc)	20s
Test (socks-proxy)	39s
Test (cookies)	28s
build_versions (1.67.0)	20s
cargo-deny (i686-unknown-linux-gnu)	21s
Test (socks-proxy)	31s
Test (gzip)	36s
cargo-deny (wasm32-unknown-unknown)	21s
Test (gzip)	24s
Test (brotli)	38s
cargo-deny (x86_64-apple-darwin)	20s
Test (json)	43s
Test (brotli)	28s
Test (native-tls)	42s
Test (json)	25s
Test (native-tls)	40s
cargo-deny (x86_64-apple-ios)	22s
cargo-deny (x86_64-pc-windows-gnu)	19s
cargo-deny (x86_64-pc-windows-msvc)	24s
cargo-deny (x86_64-unknown-linux-gnu)	21s
cargo-deny (x86_64-unknown-redox)	18s
	15m 6s

Provide feedback