public String getXXSSProtectionHTTPResponseHeader() {
    return getProperty(HTTP_X_XSS_PROTECTION_HEADER_VALUE);
  }
Get the value that should be set for the <code>X-XSS-Protection</code> HTTP response header for Ambari Server UI.
<p/>
By default this will be <code>1; mode=block</code>. For example:
<p/>
<code>
X-XSS-Protection: 1; mode=block
</code>

@return the X-XSS-Protection value - null or "" indicates that the value is not set
ambari-server/src/main/java/org/apache/ambari/server/configuration/Configuration.java