Content-length retrieval: Measure the size of the php script (default).
DRP_CLR_BUFFER
DRP_CLR_BUFFER
Content-length retrieval: Measure the size of the php output buffer (approximation).
DRP_CLR_CUSTOM
DRP_CLR_CUSTOM
Content-length retrieval: Measure the size of an individual file. The filename/path is set via the "parameter" attribute of the DataRetrievalPolicy object.