How use Basic authorization in API Action on frontend

[vv-a2007]

At the end of a long search, I found a way around the problem, but I still didn’t understand the reason

API Action working on front and not working in Server Action

After several days of experimentation, we managed to find a strange but working scheme. I created a website on PHP hosting and made a script on it to call an external API, that is, something like a proxy. That is, I first call the Server Action, from it a PHP script in which an external service is called, I receive a link to the generated PDF from there, and in the Server Action I download the file and send it to S3 storage. Oddly enough, this scheme works, unlike the direct one inside the Serve…