Proxy.pac file performance optimization

javascriptpacPROXY

I reroute certain websites through a proxy with a proxy.pac file.

It basically looks like this:

if (shExpMatch(host, "www.youtube.com"))
    { return "PROXY proxy.domain.tld:8080; DIRECT" }
if (shExpMatch(host, "youtube.com"))
    { return "PROXY proxy.domain.tld:8080; DIRECT" }

At the moment about 125 sites are rerouted using this method.
However, I plan on adding quite a few more domains to it, and I'm guessing it will eventually be a list of 500-1000 domains.

It's important to not reroute all traffic through the proxy.

What's the best way to keep this file optimized, performance-wise ?

Thanks

Best Answer

As usual: hashes or trees.

I'd use hashing: extract the first one (or more chars) of the requested domain name (stripping "www." as well) to select corresponding pattern list.

Related Solutions

Proxy.pac file – accessing a site on non standard port to be sent direct

This seems to work fine for me:

function FindProxyForURL(url, host) {

    if ( shExpMatch(url, "http://www.test.com:765/*") ) { return "DIRECT"; }

    return "PROXY proxy:port";
}

BTW, you can use alert() for debugging, at least under IE. It's crappy, but it at least gets you some insight into what the script is doing. Obviously, remove them before going into production.

Global (computer-wide) proxy settings from pac file

Unfortunately there isn't a global proxy configuration in Windows (outside of Internet Options) that all apps pay attention to. Many apps don't use Internet Options, and many of those that don't don't support proxy autoconfigs. For those that don't you're relinquished to manually configuring them.

What app(s) are you looking to configure? There are ways to centrally maintain some things to take the administrative burden off a bit.

Best Answer

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Proxy.pac file – accessing a site on non standard port to be sent direct

Global (computer-wide) proxy settings from pac file

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