Return a short error message to a client
int Ns_ReturnError( Ns_Conn *conn, int status, char *fmt, ... );
The Ns_ReturnError function is supported for backward compatibility only. You should use the new, more specific error functions such as Ns_ConnReturnBadRequest, Ns_ConnReturnUnauthorized, Ns_ConnReturnForbidden, and Ns_ConnReturnNotFound. Ns_ReturnError returns a status of NS_OK or NS_ERROR.