Web Server 6.1 SP13 extends the Netscape Server Application Programmer's Interface (NSAPI) to support NSAPI filters.
NSAPI filters enable the custom processing of HTTP request and response streams. This processing enabled a function to intercept and potentially modify the content presented to or generated by another function. For example, a plug-in could install a NSAPI filter to intercept a XML page generated by another plug-in's Server Application Function (SAF) and then transform that XML page into a HTML, XHTML, or WAP page appropriate for the client. Alternatively, a NSAPI filter could decompress data received from a client before presenting it to another plug-in.
For more information about NSAPI filters, see Sun Java System Web Server 6.1 SP12 NSAPI Programmer’s Guide.