8a340dfd3b847428

// 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{
		0x0006,
		0x0003,
		0xc085,
		0xc047,
		0xc019,
		0xc018,
		0x00c5,
		0x00bf,
		0x00a7,
		0x00a6,
		0x0089,
		0x006d,
		0x006c,
		0x0046,
		0x003a,
		0x0034,
		0xc084,
		0xc05b,
		0xc05a,
		0xc046,
		0xc017,
		0x009b,
		0x001b,
		0xc016,
		0x001a,
		0x0019,
		0x0018,
		0x0017,
		0xc03b,
		0xc03a,
		0xc039,
		0xc015,
		0xc010,
		0xc00b,
		0xc006,
		0xc001,
		0x00ba,
		0x00b9,
		0x00b8,
		0x00b5,
		0x00b4,
		0x00b1,
		0x00b0,
		0x002e,
		0x002d,
		0x002c,
		0x0002,
		0x0001,
		0x00fd,
		0x00fc,
		0x00fb,
		0x00fa,
		0x00f9,
		0x00f8,
		0x00e8,
		0x00e7,
		0x00e6,
		0x00e5,
		0x0083,
		0x0082,
		0x0081,
		0x0080,
		0x002b,
		0x002a,
		0x00ff,
	},
	CompressionMethods: []byte{
		0x00, // compressionNone
		0x01
	},
	Extensions: []tls.TLSExtension{
		&tls.SupportedCurvesExtension{[]tls.CurveID{
			0x001e,
			tls.X25519,
			tls.CurveP384,
			tls.CurveP256,
			tls.CurveP521,
			0x0100,
			0x0101,
			0x000e,
			0x000d,
			0x001c,
			0x000c,
			0x000b,
			0x001b,
			0x000a,
			0x0009,
			0x0016,
			0x001a,
			0x0008,
			0x0007,
			0x0006,
			0x0015,
			0x0014,
			0x0004,
			0x0005,
			0x0013,
			0x0012,
			0x0002,
			0x0003,
			0x0001,
			0x0010,
			0x0011,
			0x000f,
		}},
		&tls.SupportedPointsExtension{SupportedPoints: []byte{
			0x00, // pointFormatUncompressed
		}},
		&tls.SignatureAlgorithmsExtension{SupportedSignatureAlgorithms: []tls.SignatureScheme{
			0x0808,
			0x0807,
			0x080b,
			0x080a,
			0x0809,
			tls.PSSWithSHA512,
			tls.PSSWithSHA384,
			tls.PSSWithSHA256,
			tls.ECDSAWithP521AndSHA512,
			tls.ECDSAWithP384AndSHA384,
			tls.ECDSAWithP256AndSHA256,
			0x0303,
			tls.PKCS1WithSHA512,
			tls.PKCS1WithSHA384,
			tls.PKCS1WithSHA256,
			0x0301,
			tls.ECDSAWithSHA1,
			0x0202,
			tls.PKCS1WithSHA1,
			0x0101,
		},},
		&tls.ALPNExtension{AlpnProtocols: []string{"http/1.1","h2"}},
		&tls.GenericExtension {Id: 0x0016}, // WARNING: UNKNOWN EXTENSION, USE AT YOUR OWN RISK
		&tls.UtlsExtendedMasterSecretExtension{},
		&tls.UtlsPaddingExtension{GetPaddingLen: tls.BoringPaddingStyle},
	},
}
tlsConn.ApplyPreset(&clientHelloSpec)
        
n, err = tlsConn.Write([]byte("Hello, World!"))
// or tlsConn.Handshake() for better control