How to write an outgoing URL call and get the XML response?

I have to write a call from my rails app to an external URL :

http://999:[email protected]/apis/media.php?action=createCollection&collection_id=123

then I should get back an XML answer , to be parsed (I need to reuse
these info into my web app)

180 2 myNewCollection this is my new sports collection static 7fd77f35ba63b07a19d8eb995d66215f 123 /123/180

where should I look for info on it ?
as I don’t supply a return URL, I don’t know how to handle the answer
in Rails …

thanks for your help…