Send feedback App Engine Documentation PHP Standard Environment for PHP 5 Docs API Documentation \google\appengine\runtime\RPCFailedError Thrown by APIProxy calls when the RPC to the application server fails. Was this page helpful? Let us know how we did: Send feedback Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4.0 License, and code samples are licensed under the Apache 2.0 License. For details, see our Site Policies. Java is a registered trademark of Oracle and/or its affiliates. Last updated June 3, 2019.