cf5920b9ec4efda0

// import tls "github.com/refraction-networking/utls"
tcpConn, err := net.Dial("tcp", "tlsfingerprint.io:443")
if err != nil {
	fmt.Printf("net.Dial() failed: %+v\n", err)
	return
}

config := tls.Config{ServerName: "tlsfingerprint.io"}
// This fingerprint includes feature(s), not fully supported by TLS.
// uTLS client with this fingerprint will only be able to to talk to servers,
// that also do not support those features. 
tlsConn := tls.UClient(tcpConn, &tlsConfig, tls.HelloCustom)
clientHelloSpec := tls.ClientHelloSpec {
	CipherSuites: []uint16{
		0x1305,
		0x1304,
		tls.TLS_AES_128_GCM_SHA256,
		tls.TLS_AES_256_GCM_SHA384,
		tls.TLS_CHACHA20_POLY1305_SHA256,
		0xc0b4,
		0xc0b5,
		0x00c7,
		0x00c6,
		0xc0b2,
		0xc0b0,
		0xc0b3,
		0xc0b1,
	},
	CompressionMethods: []byte{
		0x00, // compressionNone
	},
	Extensions: []tls.TLSExtension{
		&tls.SupportedVersionsExtension{[]uint16{
			tls.VersionTLS13,
		}},
		&tls.SupportedCurvesExtension{[]tls.CurveID{
			tls.CurveP256,
			tls.CurveP384,
			tls.CurveP521,
			tls.X25519,
			0x0100,
			0x0029,
		}},
		&tls.SupportedPointsExtension{SupportedPoints: []byte{
			0x00, // pointFormatUncompressed
		}},
		&tls.SignatureAlgorithmsExtension{SupportedSignatureAlgorithms: []tls.SignatureScheme{
			tls.PKCS1WithSHA256,
			tls.PKCS1WithSHA512,
			tls.ECDSAWithP256AndSHA256,
			tls.ECDSAWithP521AndSHA512,
			tls.PSSWithSHA256,
			tls.PSSWithSHA512,
			0x0807,
			0x0808,
			0x0809,
			0x080b,
			tls.PKCS1WithSHA1,
			tls.ECDSAWithSHA1,
			0x0708,
		},},
		&tls.KeyShareExtension{[]tls.KeyShare{
		}},
	},
}
tlsConn.ApplyPreset(&clientHelloSpec)
        
n, err = tlsConn.Write([]byte("Hello, World!"))
// or tlsConn.Handshake() for better control