send_json to set content-type #2356

Job	Run time
Test	37s
build_versions (stable)	20s
Test (charset)	37s
cargo-deny (aarch64-apple-ios)	22s
build_versions (beta)	17s
Test	30s
Test (cookies)	44s
cargo-deny (aarch64-linux-android)	21s
Test (charset)	26s
build_versions (1.67.0)	19s
cargo-deny (i686-pc-windows-gnu)	17s
Test (socks-proxy)	41s
Test (cookies)	35s
cargo-deny (i686-pc-windows-msvc)	24s
Test (gzip)	36s
Test (socks-proxy)	27s
cargo-deny (i686-unknown-linux-gnu)	19s
Test (brotli)	39s
Docs	23s
Test (gzip)	29s
cargo-deny (wasm32-unknown-unknown)	21s
Test (json)	42s
Test (brotli)	26s
cargo-deny (x86_64-apple-darwin)	19s
Test (native-tls)	45s
Test (json)	28s
cargo-deny (x86_64-apple-ios)	18s
Lint	19s
Test (native-tls)	43s
cargo-deny (x86_64-pc-windows-gnu)	17s
cargo-deny (x86_64-pc-windows-msvc)	22s
cargo-deny (x86_64-unknown-linux-gnu)	18s
cargo-deny (x86_64-unknown-redox)	22s
	15m 3s

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