Full request posted below. The gif is on the server it's proxying to. Not on the proxy server. The flow is client -> ASM -> proxy server. Was attempting to protect the proxy server.
Thanks.
Flags Requested Object Response Code Internal Use
[HTTPS] /images/images/view-attachments.gif 304 Yes
Full Request
GET /images/images/view-attachments.gif HTTP/1.1
Accept: */*
Referer: https://proxyserver.mydomain.com/homepage/homepage.jsp
Accept-Language: en-us
UA-CPU: x86
Accept-Encoding: gzip, deflate
If-Modified-Since: Mon, 31 Jan 2000 19:34:12 GMT
User-Agent: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.0; GTB5; SLCC1; .NET CLR 2.0.50727; Media Center PC 5.0; .NET CLR 3.0.04506; InfoPath.2; .NET CLR 1.1.4322)
Host: proxyserver.mydomain.com
Connection: Keep-Alive
Cookie: TSb074f7=67bcdaf929e6111babadd04136b0feba160b99a96fbee49749be4837c8f0c0030d53b05734d55be3ffabebb2; jsessionid=384121237208175220; userInfo=userID%3D17c