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I've had a Google Apps Script web app running for a bit over a year which gave users an option to download a csv file. It worked perfectly fine, although in the console it gave a warning about downloading from an iFrame being deprecated.
After updating Chrome, I now get the following error when trying to download:
Download is disallowed. The frame initiating or instantiating the download is sandboxed, but the flag ‘allow-downloads’ is not set. See https://www.chromestatus.com/feature/5706745674465280 for more details.
When following the above link, it provides the following information:
Chrome is planning on removing this capability - i.e. Chrome is going to block all downloads initiated from or instantiated in a sandboxed iframe by default. The embedder may add "allow-downloads" to the sandbox attributes list to opt in. This allows content providers to restrict malicious or abusive downloads.
How can I add "allow-downloads" to the sandbox attributes in the Google Apps Script environment? Alternatively, is there a workaround to enable downloading files?
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This error means that your computer's security settings blocked the file. Learn more about blocked downloads. On Windows: Windows Attachment Manager could have removed the file you tried to download. To see what files you can download or why your file was blocked, check your Windows internet security settings.
There are a few possible causes for these errors: A Google server or system is temporarily unavailable. Wait for a few moments and try running the script again. There is an error in your script that doesn't have a corresponding error message.
It is discussed here https://issuetracker.google.com/issues/157368720 that HtmlService.XFrameOptionsMode.ALLOWALL should set allow-downloads on GAS web app sandbox. We should watch this issue for changes.
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Include sandbox="allow-downloads" in your iframe tag, which contains the code that is used for downloading the CSV file.
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