ERROR
When adding a custom widget in ArcGIS Enterprise's Experience Builder, entering the manifest URL returns the following error message:
Error: The URL does not reference an AppBuilder Extension.
Note: The following workarounds may require the assistance of the organization's IT team.
In the Portal Administrator Directory, specify the web server in the list of approved addresses. Refer to Portal for ArcGIS: Restrict the portal's proxy capability for further instructions.
Note: If the web server is controlled by a third party, take into account the security implications of adding the web server to the address list of allowed proxy hosts.
Set the permission for the folder location where the custom widget file is stored in the intended web server. To set the permissions, refer to the Solution section in Error: The ArcGIS Server is not able to connect to the specified directory.
When specifying the manifest URL, the URL format is as follows:
https://<server.domain.com>/<widgetPath>/manifest.json
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