Example 5: Balance Proxy Load with dnsDomainIs()

This example is more sophisticated. There are four proxy servers, with one of them acting as a hot standby for the others, so if any of the remaining three goes down, the fourth one takes over. 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 as shown in Example 5: Balance Proxy Load with dnsDomainIs().

All local accesses should be direct. All proxy servers run on port 8080. You can concatenate strings by using the + operator in JavaScript.

function FindProxyForURL(url, host)
{
    if (isPlainhost name(host) || dnsDomainIs(host, ".mydomain.com"))
        return "DIRECT";

    else if (dnsDomainIs(host, ".com"))
        return "PROXY proxy1.mydomain.com:8080; " +
              "PROXY proxy4.mydomain.com:8080";

    else if (dnsDomainIs(host, ".edu"))
        return "PROXY proxy2.mydomain.com:8080; " +
              "PROXY proxy4.mydomain.com:8080";

    else
        return "PROXY proxy3.mydomain.com:8080; " +
              "PROXY proxy4.mydomain.com:8080";
}