+ | cr | boolean | Optional | If the SDK fails to load and the endpoint value defined for `src` is the public CDN location, this configuration option attempts to immediately load the SDK from one of the following backup CDN endpoints:<ul><li>js.monitor.azure.com</li><li>js.cdn.applicationinsights.io</li><li>js.cdn.monitor.azure.com</li><li>js0.cdn.applicationinsights.io</li><li>js0.cdn.monitor.azure.com</li><li>js2.cdn.applicationinsights.io</li><li>js2.cdn.monitor.azure.com</li><li>az416426.vo.msecnd.net</li></ul>NOTE: az416426.vo.msecnd.net is partially supported, so it's not recommended.<br><br>If the SDK successfully loads from a backup CDN endpoint, it loads from the first available one, which is determined when the server performs a successful load check. If the SDK fails to load from any of the backup CDN endpoints, the SDK Failure error message appears.<br><br>When not defined, the default value is `true`. If you don’t want to load the SDK from the backup CDN endpoints, set this configuration option to `false`.<br><br>If you’re loading the SDK from your own privately hosted CDN endpoint, this configuration option is not applicable.
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