Test of Proxy Auto-Configuration (PAC) file as a replacement for messing with /etc/hosts

local-devtree-proxy.pac

function FindProxyForURL( url, host ) {
    var debugging = false;
    var debugPAC;
    if (debugging) {
        debugPAC  = "host: "+ host +"\n";
        debugPAC += "url: "+ url +"\n";
        debugPAC += "dnsDomainIs(host, 'devtree.opentreeoflife.org'): "+ dnsDomainIs(host, "devtree.opentreeoflife.org") +"\n";
        debugPAC += "dnsDomainIs( host, '.devtree.opentreeoflife.org' ): "+ dnsDomainIs( host, '.devtree.opentreeoflife.org' ) +"\n";
        debugPAC += "shExpMatch(host, 'devtree.opentreeoflife.org'): "+ shExpMatch(host, "devtree.opentreeoflife.org") +"\n";
    }
    if(shExpMatch(host, 'devtree.opentreeoflife.org')
        /* OR use other options like so:
        shExpMatch(host, "devtree.opentreeoflife.org")
        || dnsDomainIs( host, ".devapi.opentreeoflife.org" )
        || dnsDomainIs( host, ".baz.example.com" )
         */
    ) {
        // It's the web-app server! Proxy to the local test server instead.
        ProxyConfig = "PROXY localhost";
    }
    
    // Reduce volume of alerts to a useable level
    // TODO: Filter for the main request of the tree-viewer Feedback page?
    if (debugging && shExpMatch(host, 'devtree.opentreeoflife.org')) {  // shExpMatch(url,"*/contact")) {
        // N.B. These alerts will appear in odd places
        //   - Chrome, browse to chrome://net-internals/#events and filter for 'PAC_JAVASCRIPT_ALERT'
        alert(debugPAC);
    }

    if(shExpMatch(url, "http://devtree.opentreeoflife.org/") ||
       shExpMatch(url, "https://devtree.opentreeoflife.org/")) {
        // It's the web-app server! Proxy to the local test server instead.
        alert("DEVTREE! using localhost proxy...");
        return "PROXY localhost";
    }
    return "DIRECT";
}