Fix host header for connect proxy #2674

Job	Run time
build_versions (stable)	3m 6s
Test	52s
build_versions (beta)	2m 59s
Test	1m 2s
Test (charset)	52s
build_versions (1.71.1)	3m 1s
Test (charset)	1m 11s
Test (cookies)	56s
Test (cookies)	1m 7s
Test (socks-proxy)	56s
Test (socks-proxy)	1m 13s
cargo-deny (aarch64-apple-ios)	20s
Test (gzip)	56s
Test (gzip)	1m 6s
cargo-deny (aarch64-linux-android)	20s
Test (brotli)	52s
Test (brotli)	1m 9s
cargo-deny (i686-pc-windows-gnu)	22s
Test (json)	1m 9s
cargo-deny (i686-pc-windows-msvc)	21s
Test (json)	58s
Test (native-tls)	1m 12s
cargo-deny (i686-unknown-linux-gnu)	20s
Test (native-tls)	58s
cargo-deny (wasm32-unknown-unknown)	19s
Test (rustls-no-provider)	1m 8s
Docs	1m 39s
cargo-deny (x86_64-apple-darwin)	22s
cargo-deny (x86_64-apple-ios)	19s
Lint	37s
cargo-deny (x86_64-pc-windows-gnu)	19s
cargo-deny (x86_64-pc-windows-msvc)	23s
cargo-deny (x86_64-unknown-linux-gnu)	18s
cargo-deny (x86_64-unknown-redox)	22s
	33m 4s

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