proxy: use the same data for CONNECT and Host header #2764

Job	Run time
Docs	1m 43s
Test	52s
Test (charset)	1m 3s
build_versions (stable)	16s
Test (cookies)	1m 6s
Test	43s
build_versions (beta)	14s
cargo-deny (aarch64-apple-ios)	20s
Test (socks-proxy)	1m 10s
Test (charset)	47s
build_versions (1.71.1)	16s
cargo-deny (aarch64-linux-android)	17s
Test (gzip)	1m 4s
Test (cookies)	1m 1s
cargo-deny (i686-pc-windows-gnu)	17s
Test (brotli)	1m 13s
Test (socks-proxy)	44s
cargo-deny (i686-pc-windows-msvc)	20s
Test (json)	1m 4s
Test (gzip)	46s
cargo-deny (i686-unknown-linux-gnu)	19s
Test (native-tls)	1m 3s
Test (brotli)	45s
Lint	42s
cargo-deny (wasm32-unknown-unknown)	20s
Test (json)	46s
cargo-deny (x86_64-apple-darwin)	18s
Test (native-tls)	1m 21s
cargo-deny (x86_64-apple-ios)	17s
Test (rustls-no-provider)	49s
cargo-deny (x86_64-pc-windows-gnu)	18s
cargo-deny (x86_64-pc-windows-msvc)	18s
cargo-deny (x86_64-unknown-linux-gnu)	18s
cargo-deny (x86_64-unknown-redox)	18s
	23m 8s

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