![]() ![]() Please look at my uploaded dbc file which may be helpful.I'm pretty sure the driver proxy is available on all clouds, but it probably isn't available on all cluster types.Load external html in Iframe and access the contents. IFrame does not work for local sources HTML. html iframe element cannot load an empty webpage (no text or images on the body element). you can put auth for driver-proxy-api endpoints with a token= param in the url Or else make 'test' directory publicly accessible.So the suspect - You can definitely make ajax calls from inside the iframe sandbox. I suspect auth wasn't properly configured for the driver-proxy endpoint. Iframes pose fewer accessibility issues, though require additional work and management of multiple pages. Try to serve the upload form from the server inside the notebook and displaying it as a webpage (in an iframe or a popup) with a convenient origin, but that doesn't work as the Auhentication header is mandatory to call the driver-proxy-api. ![]() Try to escape the iframe sandboxing by opening a popup, but it seems to inherit the same issue (although it's not clear why, as there's the flag allow-popups-to-escape-sandbox). • So even by creating a CORS-friendly server in the notebook exposed through the driver-proxy-api, it's not called from the sandbox. The HTML
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