Google Analytics today announced a new web analytics feature: "client side POST" support, that further improves the accuracy of Google Analytics, especially for sites with very long URLs and long event tracking parameters.
"Traditionally, client-side tracking code beacons have been sent via HTTP GET requests, which are limited to 2048 bytes by some browsers and proxies. Requests sent to Analytics that exceeded this limit were dropped, and the data never reached Google Analytics.
Starting with this release, requests longer than 2048 bytes will be sent via HTTP POST, which has no such limit. The tracking code will now support beacons up to 8192 bytes!," explains Google.