f4f8bdfcf4e66096

// 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"}
tlsConn := tls.UClient(tcpConn, &tlsConfig, tls.HelloCustom)
clientHelloSpec := tls.ClientHelloSpec {
	CipherSuites: []uint16{
		tls.GREASE_PLACEHOLDER,
		tls.TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305,
		tls.TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305,
		tls.OLD_TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256,
		tls.OLD_TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256,
		tls.TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,
		tls.TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,
		tls.TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384,
		tls.TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,
		tls.TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA,
		tls.TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA,
		tls.TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA,
		tls.TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA,
		tls.TLS_RSA_WITH_AES_128_GCM_SHA256,
		tls.TLS_RSA_WITH_AES_256_GCM_SHA384,
		tls.TLS_RSA_WITH_AES_128_CBC_SHA,
		tls.TLS_RSA_WITH_AES_256_CBC_SHA,
		tls.TLS_RSA_WITH_3DES_EDE_CBC_SHA,
	},
	CompressionMethods: []byte{
		0x00, // compressionNone
	},
	Extensions: []tls.TLSExtension{
		&tls.UtlsGREASEExtension{},
		&tls.RenegotiationInfoExtension{Renegotiation: tls.RenegotiateOnceAsClient},
		&tls.SNIExtension{},
		&tls.UtlsExtendedMasterSecretExtension{},
		&tls.SessionTicketExtension{},
		&tls.SignatureAlgorithmsExtension{SupportedSignatureAlgorithms: []tls.SignatureScheme{
			tls.PKCS1WithSHA512,
			tls.ECDSAWithP521AndSHA512,
			tls.PKCS1WithSHA384,
			tls.ECDSAWithP384AndSHA384,
			tls.PKCS1WithSHA256,
			tls.ECDSAWithP256AndSHA256,
			tls.PKCS1WithSHA1,
			tls.ECDSAWithSHA1,
		},},
		&tls.StatusRequestExtension{},
		&tls.SCTExtension{},
		&tls.ALPNExtension{AlpnProtocols: []string{"h2","http/1.1"}},
		&tls.FakeChannelIDExtension{},
		&tls.SupportedPointsExtension{SupportedPoints: []byte{
			0x00, // pointFormatUncompressed
		}},
		&tls.SupportedCurvesExtension{[]tls.CurveID{
			tls.CurveID(tls.GREASE_PLACEHOLDER),
			tls.X25519,
			tls.CurveP256,
			tls.CurveP384,
		}},
		&tls.UtlsGREASEExtension{},
	},
}
tlsConn.ApplyPreset(&clientHelloSpec)
        
n, err = tlsConn.Write([]byte("Hello, World!"))
// or tlsConn.Handshake() for better control