//		Whether the linker should use external linking mode
//		when using -linkmode=auto with code that uses cgo.
//		Set to 0 to disable external linking mode, 1 to enable it.
//	GIT_ALLOW_PROTOCOL
//		Defined by Git. A colon-separated list of schemes that are allowed
//		to be used with git fetch/clone. If set, any scheme not explicitly
//		mentioned will be considered insecure by 'go get'.

		{"foo\x00bar: foo\r\n", 400},                         // binary in header
		{"Foo: " + strings.Repeat("x", 1<<21) + "\r\n", 431}, // header too large
		// Spaces between the header key and colon are not allowed.
		// See RFC 7230, Section 3.2.4.
		{"Foo : bar\r\n", 400},
		{"Foo\t: bar\r\n", 400},

		// Empty header keys are invalid.
		// See RFC 7230, Section 3.2.
		{": empty key\r\n", 400},