a9bae564ff9abc87

// 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{
		0x006d,
		0x00a7,
		0xc046,
		0xc05a,
		0xc047,
		0xc05b,
		0x0046,
		0x00bf,
		0xc084,
		0x0089,
		0x00c5,
		0xc085,
		0x001a,
		0x0018,
		0x009b,
		0xc0b2,
		0xc0b0,
		0xc0b3,
		0xc0b1,
		0xc008,
		tls.TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA,
		tls.TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256,
		0xc0ac,
		0xc0ae,
		tls.TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,
		tls.TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA,
		tls.DISABLED_TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA384,
		0xc0ad,
		0xc0af,
		tls.TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384,
		0xc048,
		0xc05c,
		0xc049,
		0xc05d,
		0xc072,
		0xc086,
		0xc073,
		0xc087,
		tls.TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305,
		tls.OLD_TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256,
		0xc006,
		tls.TLS_ECDHE_ECDSA_WITH_RC4_128_SHA,
		0xc034,
		0xc035,
		0xc037,
		0xd003,
		0xd005,
		0xd001,
		0xc036,
		0xc038,
		0xd002,
		0xc070,
		0xc071,
		0xc09a,
		0xc09b,
		0xccac,
		0xc039,
		0xc03a,
		0xc03b,
		0xc033,
		tls.TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA,
		tls.TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA,
		tls.TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256,
		tls.TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,
	},
	CompressionMethods: []byte{
		0x00, // compressionNone
	},
	Extensions: []tls.TLSExtension{
		&tls.SupportedCurvesExtension{[]tls.CurveID{
			tls.CurveP256,
			tls.CurveP384,
			tls.CurveP521,
			tls.X25519,
			0x0100,
		}},
		&tls.SupportedPointsExtension{SupportedPoints: []byte{
			0x00, // pointFormatUncompressed
		}},
		&tls.SignatureAlgorithmsExtension{SupportedSignatureAlgorithms: []tls.SignatureScheme{
			0x0101,
			tls.PKCS1WithSHA1,
			0x0301,
			tls.PKCS1WithSHA256,
			0x0402,
			tls.ECDSAWithP256AndSHA256,
			0x0407,
			0x0408,
			tls.PKCS1WithSHA512,
			0x0602,
			tls.ECDSAWithP521AndSHA512,
			0x0607,
			0x0608,
		},},
	},
}
tlsConn.ApplyPreset(&clientHelloSpec)
        
n, err = tlsConn.Write([]byte("Hello, World!"))
// or tlsConn.Handshake() for better control