In this example, the proxy server is selected by translating the host name into an IP address and then comparing the address to a specified string. In this example, the proxy server is selected by explicitly getting the IP address and then comparing it to a specified string.
If no protocol match occurs, the server makes a direct connection. Specifically, the myIpAddress function returns the IP address in integer-period format for the host that the browser is running on. In this example, the function looks to see if there are periods. If there are any periods, the connection occurs using a proxy server. If there are no periods, a direct connection occurs. Specifically, the dnsDomainLevels function returns an integer equal to the number of periods in the host name.
Note This is another way to determine connection types based on host name characteristics. In this example, the function decides whether to connect to a proxy server, based on the days of the week. Specifically the weekdayRange day1 [,day2] [,GMT] function returns whether the current system time falls within the range specified by the parameters day1 , day2 , and GMT.
Only the first parameter is required. This function is particularly useful for situations where you want to use a proxy server for heavy traffic times, but allow a direct connection when traffic is light. Skip to main content. This browser is no longer supported. Download Microsoft Edge More info. Contents Exit focus mode. Use proxy auto-configuration. In this example all of the hosts in a given subnet are connected-to directly, others are connected through the proxy:.
Again, use of the DNS server in the above can be minimized by adding redundant rules in the beginning:. This example is more sophisticated. There are four 4 proxy servers; one of them is a hot stand-by for all of the other ones, so if any of the remaining three goes down the fourth one will take over.
Furthermore, the three remaining proxy servers share the load based on URL patterns, which makes their caching more effective there is only one copy of any document on the three servers - as opposed to one copy on each of them.
The load is distributed like this:. All local accesses are desired to be direct. All proxy servers run on the port they don't need to, you can just change your port but remember to modify your configuations on both side. As an example, to set different proxies based on the protocol the startsWith function can be used:. Note: The same can be accomplished using the shExpMatch function described earlier.
Note: The autoconfig file can be output by a CGI script. Usage of isInNet , isResolvable and dnsResolve functions should be carefully considered, as they require the DNS server to be consulted.
All the other autoconfig-related functions are mere string-matching functions that don't require the use of a DNS server. Most of the time these functions are not necessary to achieve the desired result.
Proxy auto-config was introduced into Netscape Navigator 2. Open-sourcing Netscape eventually lead to Firefox itself. These utilities are found in many other open-source systems including Chromium.
Firefox later integrated the file into ProxyAutoConfig. To extract it into its own file, it suffices to copy the chunk into JavaScript with a console.
Microsoft in general made its own implementation. There used to be some problems with their libraries , but most are resolved by now. They have defined some new "Ex" suffixed functions around the address handling parts to support IPv6. The feature is supported by Chromium, but not yet by Firefox bugzilla PROXY w3proxy. The auto-config file should be saved to a file with a. The examples at the end of this document are complete. There is no additional syntax needed to save it into a file and use it.
The PAC file is named proxy. Syntax isPlainHostName host. Syntax dnsDomainIs host , domain. If the certificate is invalid, when Firefox v 7. From this error window, it is not possible to install the certificate. Then after you close and reopen the browser, the PAC file should be downloaded correctly. IE 8 will silently drop the PAC file if the certificate is invalid.
You can install the certificate using the following procedure:. If you see a broken image, please right-click and select 'Open image in a new tab'. We apologize for this inconvenience.
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