48 CHAPTER 1: WEB CACHING CONCEPTS AND DEPLOYMENT8 Click OK.To manually configure Netscape Navigator 4.5 or 6:1 Open Netscape Navigator.2 From the Edit menu, click Preferences.3 Click the Advanced category and click Proxies.4 Select Manual Proxy Configuration.5 Click View.6 Enter the URL or location of the Webcache in the HTTP, Security and FTPfields.7 Enter a caching port number on which the Webcache is listening in eachPort field. The default port number is 8080.8 Click OK.Proxy AutoConfiguration (PAC)FilesYou can use a Proxy Auto Configuration (PAC) file to configure the Webbrowser on each client machine. PAC files allow you to createconfiguration rules that determine how the Web browser operates whenthe Webcache is being deployed as a Proxy cache. The PAC file can bestored either on the Webcache or a network server, and the Web browseris set to read the PAC file when it is opened.The PAC file is read once when the Web browser is first opened, and thenexecuted within the browser for every object within every Web pagevisited. This can cause a perceived response time degradation, althoughthe performance degradation is likely to be small.For further information, see “Creating a Proxy Auto-configuration File”on page 115.You can only use a PAC file to configure the Web browsers on clientmachines when the Webcache is operating in Proxy cache mode.PAC Files and Load BalancingYou can use a PAC file to load balance Web requests from client machinesbetween up to four Webcaches in your network, achieving higherperformance and resiliency. If one Webcache fails, Web requests willautomatically be sent to the other available Webcaches.dua1611-5aaa04.book Page 48 Friday, November 29, 2002 8:56 PM
