0 if success

Error :

• EOK if no error.
• EARGNIL if the argument is nil.
• ECLOSED if the connection is already closed.
• ENOFOUND if the internal _http_connection_ object is not found.
• EFLAG if the connection is not compatible.
• ECONN if the connection has another problem.
• EPLATFORM if the current platform is not still supported for this function.
• EVM if a memory error occurs. The VM will exit and more informations could be found in the log file (if activated in the debug mode level).