CipherSuite.TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384);
    final ConnectionSpec spec = new ConnectionSpec.Builder(ConnectionSpec.MODERN_TLS)
        .cipherSuites(customCipherSuites.toArray(new CipherSuite[0]))
        .build();

    X509TrustManager trustManager = defaultTrustManager();
    SSLSocketFactory sslSocketFactory = defaultSslSocketFactory(trustManager);