 | 27 June 2007 01:28 (EST) Recently I had a chance to play a bit with Facebook API, which uses REST-based interface. There is ColdFusion client library developed by Andrew Duckett and called Facebook REST Client CFC and CFMX Facebook Application Starter example written by Cory Johnson. While developing application with use of FBML instead of IFRAME (which works just fine) Facebook server has started throwing "http error 500" upon calls to Callback URL of my application. Source code of error page had details of the error commented out — "Form entries incomplete or invalid". ( read more on Variables Naming Conflict ) | | |  |