Cisco Cisco Web Security Appliance S360 故障排查指南

Contributed by Khoa Nguyen and Siddharth Rajpathak, Cisco TAC
Engineers.

Jul 24, 2014

What is a Proxy Pac file, and are there any examples?

Environment: Cisco Web Security Appliance

Note: This Knowledge Base article references software which is not maintained or supported by Cisco.  The
information is provided as a courtesy for your convenience. For further assistance, please contact the software
vendor.

Reference Link: JavaScript or JScript Auto−Proxy Example Files

The following scripts provide examples of how a '.pac' file could be used to specify an auto−proxy URL. To
use these functions, you must change the proxy names, port numbers, and IP addresses.

The isInNet, isResolvable, and dnsResolve functions query a DNS server

1. 

References to Object Model objects, properties, or methods cause the proxy auto−configuration file to
fail silently. For example, the references window.open(...), alert(...), and password(...) all cause the
proxy auto−configuration file to fail on Internet Explorer.

2. 

The following function checks to see whether the hostname is a local host, and if it is, whether the connection
is direct. If the hostname is not a local host, the connection is through the proxy (proxy).
function FindProxyForURL(url, host)
 {
 if (isPlainHostName(host))
 return "DIRECT";
 else
 return "PROXY proxy:80";
 }