Sun Java System Web Server 6.1 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, allowing a function to intercept and potentially modify the content presented to or generated by another function. For example, a plugin could install an NSAPI filter to intercept an XML page generated by another plugin’s Server Application Function (SAF), then transform that XML page into an HTML, XHTML, or WAP page appropriate for the client. Alternatively, an NSAPI filter could decompress data received from a client before presenting it to another plugin.
For more information, see the Sun Java System Web Server 6.1 SP12 NSAPI Programmer’s Guide.