[Rails] storing a file download in a temp file

In my app, I have an URL to download a file from a remote site , when
using this URL in a browser I download the file...

"http://www.anotherdomain.com/resource/download/579633"

but I need to to get the content of this file within my app , as I
must encode it and transfer to another app

if I use this url with open-uri, I get the html page, not the file
itself......
should I execute the download within my app ( how) and store it in a
temp file
then open it and encode ..

how should I proceed to make it as simple as possible ?

thanks for your feedback

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