Important: For an Analytics call to use the POST method instead of the GET method in AppMeasurement (a method of solving truncated URLs in IE), you must be using the latest Visitor ID Service implementation for Marketing Cloud.
however, when a POST is done the debugger will not show the request, omnibug won't show the request, observepoint plugin won't show the request. and even using firebug or chrome developer tools 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.
is there any chance of getting a debugger that works with post requests or is there some override that can be coded to stop post requests from any browser other than IE where image request length is an issue.
I know this issue is a bit old, but I just discovered DataSlayer, a Chrome Plugin that works in the Chrome Developer Tools console (It shows up as another option at the top, along with Console and Network...). It can parse out the pixel parameters for both POST and GET requests, and also shows cookie and data layer values.