ActionScript for Flash MX: The Definitive Guide, 2nd Edition By Colin Moock
Appendix F. Support for GET and POST
On both Windows and Macintosh, the browser plugin and ActiveX control versions of Flash Player 6 fully support the HTTP GET and POST methods. However, despite this support, minor bugs in certain browser/Player combinations cause intermittent failure for functions using POST (see preceding URLs). Furthermore, prior to version 6.0.40.0, the Flash Player's POST method caused problems for Java servlets, as discussed at:
