Retrieves a specific screen asset for a given dashboard. The asset path is specified by the wildcard part of the URL.
The unique identifier of the dashboard whose asset is being requested.
The path to the screen asset (e.g., 'index.html' or 'assets/app.js').
Optional dashboard deployment id to fetch assets from (e.g. dev deployment). If omitted, the production deployment is used.
The requested asset content. The Content-Type header will indicate the asset's MIME type.