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Microsoft has also caught up with autoconfiguring options for Internet Explorer Unfortunately, Microsoft has made autoconfiguring a bit harder to incorporate into the browser You must obtain the Internet Explorer Administrator Kit (IEAK) to create autoconfiguration files Because getting IEAK requires a licensing agreement that asks each IEAK licensee to report quarterly to Microsoft regarding IEAK-related use, this author didn t get one However, I have confirmation from a good source that the IEAK documentation discusses a Netscape-like automatic proxy configuration scenario and can even use the same scripts This section applies to both IE and Navigator The only difference is that if you want this to work with IE, you must figure out how to create the appropriate files by using IEAK
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The proxy autoconfiguration is done using a special JavaScript This is true for both Netscape Navigator and IE The special JavaScript has these requirements: The proxy autoconfiguration JavaScript must implement a function called FindProxyForURL This function has the following skeleton:
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function FindProxyForURL(url, host) { // java script code goes here return proxy to use for servicing the URL ; }
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The arguments that this function receives are url and host The url is the full URL being requested and the host is the host name extracted from the URL For example, when a request for a Web page is detected by the Web browser, it calls the function:
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ret = FindProxyForURL( , )
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Note
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The host argument in the function call is really the substring between the :// and the first : or / The port number is not included in this parameter
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The function must return a string containing the necessary proxy configuration for a particular URL request The acceptable string values that represent a proxy configuration are shown in Table 10-1
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Table 10-1 Acceptable String Values for Proxy Configuration
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String NULL DIRECT PROXY host:port; SOCKS host:port; Meaning When a NULL value (not the string NULL) is returned, it tells the browser not to use any proxy for this request Connections should be made directly, without any proxies The specified proxy should be used The specified SOCKS server should be used
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Setting return values for FindProxyForURL
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As discussed in the Table 10-1, there are four potential return values Obviously, the real interesting return values are DIRECT and PROXY When you have multiple proxy or SOCKS servers, you can return a list instead of a single host:port pair For example, the following proxy configuration:
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PROXY best-proxyevoknowcom:8080; PROXY good-proxyevoknowcom:8081; PROXY soso-proxyevoknowcom:8082
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tells the browser to try best-proxyevoknowcom first, and if it fails, to then try the next one (good-proxyevoknowcom), and so on Note that each host:port pair is separated by a semicolon and the keyword PROXY is repeated for each pair If all the proxy servers fail, the user will be asked before attempting a direct connection When all proxies fail and there is no DIRECT option specified, the browser asks the user whether the proxies should be temporarily ignored and direct connections attempted To avoid user interaction, the configuration can be replaced with the following:
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PROXY best-proxyevoknowcom:8080; PROXY good-proxyevoknowcom:8081; PROXY soso-proxyevoknowcom:8082; DIRECT
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Because direct connection is already specified as the last resort, the user will not be asked before making such a connection in case of total proxy failure You can also mix PROXY and SOCKS For example:
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PROXY best-proxyevoknowcom:8080; SOCKS socks4evoknowcom:1080; DIRECT
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10 Setting up a Proxy Server
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Here the SOCKS-based proxy will be used when the primary proxy server bestproxyevoknowcom fails to respond
When a proxy fails to respond, Web browser retries the proxy after 30 minutes Each subsequent time it fails, the interval is lengthened by another 30 minutes
Using pre-defined functions in FindProxyForURL
To help Web administrators (who must also know JavaScript programming), a set of predefined functions are available These functions and their descriptions are listed in Table 10-2