Preprocess the given request. Instructs the service to perform any
preprocessing which may affect the state of the portlets (e.g. how they
are rendered).
Parameters: request - the current servlet request Parameters: response - the current servlet response Parameters: context - the application context true, if and only if processing should continue. throws: IOException - if an error occurs during preprocessing
Parameters: configuration - the tool which should be rendered Parameters: request - the current servlet request Parameters: response - the current servlet response Parameters: context - the application context a rendered(able) content throws: IOException - if an error occurs during processing.