You can use two Configuration and Administration forms to specify header options:
Check this box if you want the requesting client's IP address to be forwarded to the destination (content) server. If you do not check this box, the destination server receives the IP address of the proxy server. Leaving this box unchecked increases the clients' anonymity while surfing the Web.
Type the string to send in the header to the destination server to replace the type of browser and operating system that a client is using. For example: specifying Caching Proxy 4.0 replaces Mozilla 2.02/OS2 in the following header:
Content-Type:MIME User-Agent: Mozilla 2.02/OS2 Referer: http://www.ics.raleigh.ibm.com/WebTrafficExpress/main.html Pragma:no-cache
Type the e-mail address that the destination server reads when it parses the "From:" header. You might want to specify the e-mail address of the proxy administrator because the administrator is the person who needs to receive reports of any problems.
For more information, refer to Using the Configuration and Administration forms.