     }
 
     /**
-     * Hook for subclasses to override the retrieval of the HTTP request headers.
+     *  Returns the HTTP request headers.
+     *  Subclasses can override this method to control 
+     *  the retrieval of the HTTP request headers. 
+     *
+     *  @return The HTTP request headers.
+     *  
+     *  @langversion 3.0
+     *  @playerversion Flash 9
+     *  @playerversion AIR 1.1
+     *  @productversion Flex 3
      *  
      *  @langversion 3.0
      *  @playerversion Flash 9

     */
    public var serializationFilter:SerializationFilter;

    /** Hook for subclasses to override the serialization filter to use for a given operation */
    protected function getSerializationFilter():SerializationFilter
    {
        return serializationFilter;

    //---------------------------------

    /**
     *  Creates a new Operation. 
     * 
     *  @param service The object defining the type of service, such as 
     *  HTTPMultiService, WebService, or RemoteObject.
     *
     *  @param name The name of the service.
     *  
     *  @langversion 3.0
     *  @playerversion Flash 9
