Actually, since multipart data is intended for sending large blocks of binary data, the browser formats the post differently. Instead of the normal name/value pairing in the request header, the data of put into delimited blocks after the header. The boundry marker ussually looks something like this,
boundry=---4j546i56hi5i76in549ri-------------------------
The server isn't expected to do anything with this since handling this data is a little tricky. It would be nice if Sun added a sub class of
servlet that helped to parse multipart data but until that happens, check out the orielly multipart code from the Servlet Programming book for some ideas on handling this type of data. Better yet, if you're not uploading any files, don't use multipart encryption.
Sean