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private X509TrustManager findTrustManagerFromSocketFactory(SSLContext mCtx) {
        try {
            //SSLContext --> contextSpi(OpenSSLContextImpl) --> sslParameters(SSLParametersImpl) --> x509TrustManager(X509TrustManager)

            // find OpenSSLContextImpl
            Field contextSpiField = mCtx.getClass().getDeclaredField("contextSpi");
            contextSpiField.setAccessible(true);
            Object openSSLContextImplObj = contextSpiField.get(mCtx);

            // find SSLParametersImpl
            Field sslParametersField = openSSLContextImplObj.getClass().getSuperclass().getDeclaredField("sslParameters");
            sslParametersField.setAccessible(true);
            Object sslParametersImplObj = sslParametersField.get(openSSLContextImplObj);

            // find X509TrustManager
            Field x509TrustManagerField = sslParametersImplObj.getClass().getDeclaredField("x509TrustManager");
            x509TrustManagerField.setAccessible(true);
            Object x509TrustManagerObj = x509TrustManagerField.get(sslParametersImplObj);
            Log.i(TAG, "findTrustManagerFromSocketFactory object " + x509TrustManagerObj.getClass() + " " + (x509TrustManagerObj instanceof X509TrustManager));
            if(x509TrustManagerObj instanceof X509TrustManager) {
                return (X509TrustManager)x509TrustManagerObj;
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }