Adfocus doesn't return anything in cURL

[soft2050]

Accept Header tells what type of response the browser is looking for.
So for this: Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Expanded, asks for any of the following formats:
- (X)HTML format (HTML First)
- XML format
- Finally */* means for any type of format.

So it should be applicable for all sites