1226038404d56af6

// 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.Client(tcpConn, &tlsConfig, utls.HelloCustom)
clientHelloSpec := tls.ClientHelloSpec {
	CipherSuites: []uint16{
		0xc037,
		tls.TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256,
		0x00b2,
		0x0067,
		0xc09a,
		0xc096,
		0xc076,
		0xc072,
		0xc066,
		0xc04c,
		0xc048,
		0xc044,
		0x00be,
		0xc036,
		0xc035,
		0xc021,
		0xc01e,
		tls.TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA,
		tls.TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA,
		0x0091,
		0x0090,
		0x0045,
		0x0039,
		0x0033,
		0xc08d,
		0xc08c,
		0xc089,
		0xc088,
		0xc079,
		0xc078,
		0xc075,
		0xc074,
		0xc063,
		0xc062,
		0xc05f,
		0xc05e,
		0xc04f,
		0xc04e,
		0xc04b,
		0xc04a,
		0xc032,
		0xc031,
		0xc02e,
		0xc02d,
		0xc02a,
		0xc029,
		0xc026,
		0xc025,
		0xc00f,
		0xc00e,
		0xc005,
		0xc004,
		0xc07f,
		0xc07e,
		0xc055,
		0xc054,
		0xc041,
		0xc040,
		0x00c2,
		0x00bc,
		0x00a1,
		0x00a0,
		0x0086,
		0x0069,
		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: []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.GenericExtension {id: 0x0016}, // WARNING: UNKNOWN EXTENSION, USE AT YOUR OWN RISK
		&tls.UtlsExtendedMasterSecretExtension{},
		&tls.UtlsPaddingExtension{GetPaddingLen: BoringPaddingStyle},
	},
}
tlsConn.ApplyPreset(clientHelloSpec)
        
n, err = tlsConn.Write("Hello, World!")
// or tlsConn.Handshake() for better control