A sample tls server configuration that scored reasonably well on the Qualys SSL test.

go_tls_server_conf.go

srv := &http.Server{
	Addr: ":443",
	TLSConfig: &tls.Config{
		CipherSuites: []uint16{
			tls.TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA,
			tls.TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA,
			tls.TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,
			tls.TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,
			tls.TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA,
			tls.TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA,
			tls.TLS_ECDHE_RSA_WITH_RC4_128_SHA,
		},
	},
}

// and don't forget this:
// 
// w.Header().Set("Strict-Transport-Security","max-age=31536000; includeSubdomains")