How to assign UrlFetchApp with basic authorization to button?

Question

I created function in Google Apps Script, that works well when I run it in Google Apps Script. Output data returns to Google Sheets.

function testFunction11(         


        

Answer 1

For future searches on this topic: I had an issue with the exact same error message, where I was using UrlFetchApp#getRequest as a utility to generate a request object, then sending it with UrlFetchApp#fetchAll.

The solution was to avoid using getRequest and instead build the request by myself without using any X-Forwarded-For header, which allowed the request to complete successfully.

I can't find any documentation to support this, but I would speculate that the following issue occurred: when Google injects the X-Forwarded-For header before making a request, the IP it injects depends on the context the script gets executed in. I think Google validates that if that header is set manually, then the IP address needs to match either their GAS proxy's IP or the user's browser IP; which one to use seems to change depending on the context the script is executed in.