The newest versions of app measurement code now can do post requests as well as normal get requests. It automatically sends image requests using HTTP POST if they are too long. AppMeasurement doesn't have an option to manually force a POST call. It will, however, automatically generate a POST call if the request size is greater than 2047 bytes.
When a POST is done the debugger will not show the request, you have to take the post request information and run it through a url decoder like http://meyerweb.com/eric/tools/dencoder/ and then try to find 'pagename' to find the page name etc.