Why not clear InputStream/OutputStream when recycling the Request/Response in Http11NioProcessor

[mojie wang]

   I found it when debugging my java web project,cause wanna  trace the
HttpResponse obejct. to find where and when it's initialized. Since tomcat
don 't clear InputStream/OutputStream when recycling the Request/Response
in Http11NioProcessor ,so i couldn't figure it out.

  There are related codes :

In class org.apache.catalina.connector.Request

if (Globals.IS_SECURITY_ENABLED || Connector.RECYCLE_FACADES) {
    if (facade != null) {
        facade.clear();
        facade = null;
    }
    if (inputStream != null) {
        inputStream.clear();
        inputStream = null;
    }
    if (reader != null) {
        reader.clear();
        reader = null;
    }
}


and in class org.apache.catalina.connector.Connector


/**
 * Alternate flag to enable recycling of facades.
 */
public static final boolean RECYCLE_FACADES =
    
Boolean.parseBoolean(System.getProperty("org.apache.catalina.connector.RECYCLE_FACADES",
"false"));

Whether this design for better performance or other essential reasons? I
don't have much knowledge  about tomcat, so any help will be appreciated.