$ curl -O  -L -v  "http://po4.realtimematrix.net/openads/www/delivery/avw.php?zoneid=74"

* About to connect() to po4.realtimematrix.net port 80 (#0)
*   Trying 208.96.12.47... connected
* Connected to po4.realtimematrix.net (208.96.12.47) port 80 (#0)
> GET /openads/www/delivery/avw.php?zoneid=74 HTTP/1.1
> User-Agent: curl/7.16.3 (i686-pc-cygwin) libcurl/7.16.3 OpenSSL/0.9.8i zlib/1.2.3 libssh2/0.15-CVS
> Host: po4.realtimematrix.net
> Accept: */*
>
< HTTP/1.1 302 Found
< Date: Thu, 05 Mar 2009 19:59:51 GMT
< Server: Apache
< X-Powered-By: PHP/5.2.3
< Pragma: no-cache
< Cache-Control: private, max-age=0, no-cache
< Expires: Mon, 26 Jul 1997 05:00:00 GMT
< Set-Cookie: OAID=3d70504e0c2498bcf15aa9c80a567769; expires=Fri, 05-Mar-2010 19:59:51 GMT; path=/
< P3P: CP="CUR ADM OUR NOR STA NID"
< Set-Cookie: OAGEO=US%7CCA%7CBerkeley%7C%7C37.8781%7C-122.271%7C%7C%7C%7C%7C; path=/
< Set-Cookie: OAVARS[default]=a%3A3%3A%7Bs%3A8%3A%22bannerid%22%3Bs%3A3%3A%22112%22%3Bs%3A6%3A%22zoneid%22%3Bs%3A2%3A%2274%22%3Bs%3A6%3A%22oadest%22%3Bs%3A24%3A
%22http%3A%2F%2Fwww.vortexme.info%22%3B%7D; path=/
< Location: http://po4.realtimematrix.net/openads/www/delivery/ai.php?filename=verysocial.png&contenttype=png
< Content-Length: 0
< Content-Type: text/html
<
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0* Connection #0 to host po4.realtimematrix.net left intact
* Issue another request to this URL: 'http://po4.realtimematrix.net/openads/www/delivery/ai.php?filename=verysocial.png&contenttype=png'
* Re-using existing connection! (#0) with host po4.realtimematrix.net
* Connected to po4.realtimematrix.net (208.96.12.47) port 80 (#0)
> GET /openads/www/delivery/ai.php?filename=verysocial.png&contenttype=png HTTP/1.1
> User-Agent: curl/7.16.3 (i686-pc-cygwin) libcurl/7.16.3 OpenSSL/0.9.8i zlib/1.2.3 libssh2/0.15-CVS
> Host: po4.realtimematrix.net
> Accept: */*
>
< HTTP/1.1 200 OK
< Date: Thu, 05 Mar 2009 19:59:51 GMT
< Server: Apache
< X-Powered-By: PHP/5.2.3
< Last-Modified: Wed, 30 Jan 2008 11:39:46 GMT
< Content-Length: 5169
< Content-Type: image/png; name=verysocial.png
<
{ [data not shown]
Warning: Failed to create the file avw.php?zoneid=74
* Failed writing body
 52  5169   52  2709    0     0   6512      0 --:--:-- --:--:-- --:--:--  6512* Closing connection #0

curl: (23) Failed writing body

the call to the url for the ad results in redirect to the 'banner' or image file

curl on Ad network with redirect

curl

Bash