DATA  ·kcon+0x160(SB)/8, $0x5cb0a9dc5cb0a9dc
DATA  ·kcon+0x168(SB)/8, $0x5cb0a9dc5cb0a9dc
DATA  ·kcon+0x170(SB)/8, $0x76f988da76f988da
DATA  ·kcon+0x178(SB)/8, $0x76f988da76f988da
DATA  ·kcon+0x180(SB)/8, $0x983e5152983e5152
DATA  ·kcon+0x188(SB)/8, $0x983e5152983e5152
DATA  ·kcon+0x190(SB)/8, $0xa831c66da831c66d
DATA  ·kcon+0x198(SB)/8, $0xa831c66da831c66d
DATA  ·kcon+0x1A0(SB)/8, $0xb00327c8b00327c8

DATA K256<>+0x16c(SB)/4, $0x106aa070
DATA K256<>+0x170(SB)/4, $0xd192e819
DATA K256<>+0x174(SB)/4, $0xd6990624
DATA K256<>+0x178(SB)/4, $0xf40e3585
DATA K256<>+0x17c(SB)/4, $0x106aa070

DATA K256<>+0x180(SB)/4, $0x19a4c116
DATA K256<>+0x184(SB)/4, $0x1e376c08
DATA K256<>+0x188(SB)/4, $0x2748774c
DATA K256<>+0x18c(SB)/4, $0x34b0bcb5
DATA K256<>+0x190(SB)/4, $0x19a4c116
DATA K256<>+0x194(SB)/4, $0x1e376c08

		"http",
		"https",
		"mailto",
		"nntp":
		return true
	}
	return false
}

// isHost reports whether c is a byte that can appear in a URL host,
// like www.example.com or user@[::1]:8080
func isHost(c byte) bool {
	// mask is a 128-bit bitmap with 1s for allowed bytes,
	// so that the byte c can be tested with a shift and an and.
	// If c > 128, then 1<<c and 1<<(c-64) will both be zero,