51ef7edb21aca68b

// 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{
		0xc054,
		0xc055,
		0xc056,
		0xc057,
		0xc058,
		0xc059,
		0xc05c,
		0xc05d,
		0xc05e,
		0xc05f,
		0xc060,
		0xc061,
		0xc062,
		0xc063,
		0xc064,
		0xc065,
		0xc066,
		0xc067,
		0xc068,
		0xc069,
		0x00ff,
	},
	CompressionMethods: []byte{
		0x00, // compressionNone
	},
	Extensions: []tls.TLSExtension{
		&tls.SNIExtension{},
		&tls.SupportedPointsExtension{SupportedPoints: []byte{
			0x00, // pointFormatUncompressed
			0x01
			0x02
		}},
		&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,
			0x0100,
			0x0101,
			0x0102,
			0x0103,
			0x0104,
		}},
		&tls.SignatureAlgorithmsExtension{SupportedSignatureAlgorithms: []SignatureScheme{
			tls.PKCS1WithSHA512,
			0x0602,
			tls.ECDSAWithP521AndSHA512,
			tls.PKCS1WithSHA384,
			0x0502,
			tls.ECDSAWithP384AndSHA384,
			tls.PKCS1WithSHA256,
			0x0402,
			tls.ECDSAWithP256AndSHA256,
			0x0301,
			0x0302,
			0x0303,
			tls.PKCS1WithSHA1,
			0x0202,
			tls.ECDSAWithSHA1,
		},},
	},
}
tlsConn.ApplyPreset(clientHelloSpec)
        
n, err = tlsConn.Write("Hello, World!")
// or tlsConn.Handshake() for better control