Getting Feedback from a POST request - PHP

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So, I'm making an upload service, what we are using is a API from a storage service. We send a POST request containing the file(that needs to be uploaded) but the API responds with redirecting to a XML page containing a key to access the file. what I need is to:

1. Prevent HTML form from redirecting to that site.
2. Somehow recieve feedback from API
3. Use it

I tried GET, didn't work. I couldn't find any solution to even try it anywhere.