504aa36fe5ba8db5

// 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{
		0x0069,
		0x006a,
		0x006b,
		0x006c,
		0x006d,
		0x006e,
		0x006f,
		0x0070,
		0x0071,
		0x0072,
		0x0073,
		0x0074,
		0x0075,
		0x0076,
		0x0077,
		0x0078,
		0x0079,
		0x007a,
		0x007b,
		0x007c,
		0x007d,
		0x007e,
		0x007f,
		0x0080,
		0x0081,
		0x0082,
		0x0083,
		0x0085,
		0x0086,
		0x0087,
		0x0088,
		0x0089,
	},
	CompressionMethods: []byte{
		0x00, // compressionNone
	},
	Extensions: []tls.TLSExtension{
		&tls.SNIExtension{},
		&tls.SignatureAlgorithmsExtension{SupportedSignatureAlgorithms: []tls.SignatureScheme{
			tls.PKCS1WithSHA512,
			0x0602,
			tls.ECDSAWithP521AndSHA512,
			tls.PKCS1WithSHA384,
			0x0502,
			tls.ECDSAWithP384AndSHA384,
			tls.PKCS1WithSHA256,
			0x0402,
			tls.ECDSAWithP256AndSHA256,
			0x0301,
			0x0302,
			0x0303,
			tls.PKCS1WithSHA1,
			0x0202,
			tls.ECDSAWithSHA1,
		},},
		&tls.SupportedCurvesExtension{[]tls.CurveID{
			0x0001,
			0x0002,
			0x0003,
			0x0004,
			0x0005,
			0x0006,
			0x0007,
			0x0008,
			0x0009,
			0x000a,
			0x000b,
			0x000c,
			0x000d,
			0x000e,
			0x000f,
			0x0010,
			0x0011,
			0x0012,
			0x0013,
			0x0014,
			0x0015,
			0x0016,
			tls.CurveP256,
			tls.CurveP384,
			tls.CurveP521,
			0x001a,
			0x001b,
			0x001c,
			tls.X25519,
			0x001e,
			0x001f,
			0x0020,
		}},
		&tls.SupportedPointsExtension{SupportedPoints: []byte{
			0x00, // pointFormatUncompressed
		}},
	},
}
tlsConn.ApplyPreset(&clientHelloSpec)
        
n, err = tlsConn.Write([]byte("Hello, World!"))
// or tlsConn.Handshake() for better control