Fix partial redirect bug #2731

Job	Run time
build_versions (stable)	1m 8s
Test	53s
Test	48s
build_versions (beta)	1m 6s
Test (charset)	57s
cargo-deny (aarch64-apple-ios)	19s
Test (charset)	42s
build_versions (1.71.1)	1m 7s
Test (cookies)	1m 8s
cargo-deny (aarch64-linux-android)	12s
Test (cookies)	1m 7s
Test (socks-proxy)	1m 7s
cargo-deny (i686-pc-windows-gnu)	10s
Test (socks-proxy)	52s
Test (gzip)	53s
cargo-deny (i686-pc-windows-msvc)	9s
Test (gzip)	57s
Docs	1s
Test (brotli)	54s
cargo-deny (i686-unknown-linux-gnu)	8s
Test (brotli)	46s
Test (json)	1m 4s
cargo-deny (wasm32-unknown-unknown)	8s
Test (json)	44s
Test (native-tls)	1m 1s
cargo-deny (x86_64-apple-darwin)	7s
Lint	1s
Test (native-tls)	55s
cargo-deny (x86_64-apple-ios)	4s
Test (rustls-no-provider)	56s
cargo-deny (x86_64-pc-windows-gnu)	3s
cargo-deny (x86_64-pc-windows-msvc)	1s
cargo-deny (x86_64-unknown-linux-gnu)	1s
cargo-deny (x86_64-unknown-redox)	1s
	20m 30s

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