3f0a18277cd40b4e

// 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{
		tls.OLD_TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256,
		tls.OLD_TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256,
		tls.TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,
		tls.TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,
		tls.TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,
		tls.TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384,
		tls.TLS_ECDHE_RSA_WITH_RC4_128_SHA,
		tls.TLS_ECDHE_ECDSA_WITH_RC4_128_SHA,
		tls.TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256,
		tls.TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256,
		tls.TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA,
		tls.TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA,
		tls.DISABLED_TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384,
		tls.DISABLED_TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA384,
		tls.TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA,
		tls.TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA,
		0xcc15,
		0x009e,
		0x009f,
		0x0067,
		0x006b,
		0x0033,
		0x0039,
		tls.TLS_RSA_WITH_AES_128_GCM_SHA256,
		tls.TLS_RSA_WITH_AES_256_GCM_SHA384,
		tls.TLS_RSA_WITH_RC4_128_SHA,
		0x0004,
		tls.TLS_RSA_WITH_AES_128_CBC_SHA256,
		tls.DISABLED_TLS_RSA_WITH_AES_256_CBC_SHA256,
		tls.TLS_RSA_WITH_AES_128_CBC_SHA,
		tls.TLS_RSA_WITH_AES_256_CBC_SHA,
		tls.TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA,
		0x0016,
		tls.TLS_RSA_WITH_3DES_EDE_CBC_SHA,
		0x0003,
		0x0008,
		0x0006,
		0x0014,
		0x0011,
		0x0019,
		0x0017,
		0x0032,
		0xc008,
		0x0012,
		0x0013,
		0x0015,
		0x0038,
		0x0040,
		0x0066,
		0x006a,
		0x00a2,
		0x00a3,
	},
	CompressionMethods: []byte{
		0x00, // compressionNone
	},
	Extensions: []tls.TLSExtension{
		&tls.SNIExtension{},
		&tls.StatusRequestExtension{},
		&tls.SupportedCurvesExtension{[]tls.CurveID{
			tls.CurveP256,
			tls.CurveP384,
			tls.CurveP521,
		}},
		&tls.SupportedPointsExtension{SupportedPoints: []byte{
			0x00, // pointFormatUncompressed
		}},
		&tls.SignatureAlgorithmsExtension{SupportedSignatureAlgorithms: []SignatureScheme{
			tls.PKCS1WithSHA256,
			tls.ECDSAWithP256AndSHA256,
			tls.PKCS1WithSHA1,
			tls.ECDSAWithSHA1,
			0x0202,
		},},
		&tls.RenegotiationInfoExtension{renegotiation: tls.RenegotiateOnceAsClient},
		&tls.GenericExtension {id: 0x000f}, // WARNING: UNKNOWN EXTENSION, USE AT YOUR OWN RISK
	},
}
tlsConn.ApplyPreset(clientHelloSpec)
        
n, err = tlsConn.Write("Hello, World!")
// or tlsConn.Handshake() for better control