The Create URL Document step does not issue the HTTP request. The actual request occurs when the document is used by another step, such as the Send Response step or the HTTP Forward step. (Cisco Unified Contact Center Express Editor Step Reference Guide, Release 7.0(1))
And that's true - for ALL the steps that call the document created with the Create URL Document Step. For Instance, if you do this:
1. Create URL Document (from http://ipaddress/something?interesting
2. Create XML Document from the document referenced in 1.
3. Write File from the document referenced in 1
It will actually issue two HTTP requests. Serious.
You say it is obvious? Well, I expected if it has already issued the HTTP request in 2, it has no reason to reissue it in 3. Anyway, now I know.