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http://bugs.kde.org/show_bug.cgi?id=61916     
           Summary: Proxy config file causes Konqueror to hang momentarily
           Product: konqueror
           Version: unspecified
          Platform: Compiled Sources
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: general
        AssignedTo: konq-bugs@kde.org
        ReportedBy: l@lww.demon.co.uk


Version:            (using KDE KDE 3.1.3)
Installed from:    Compiled From Sources
Compiler:          GCC 3.3 
OS:          Linux

The proxy config file, below, seems to cause Konqueror to hang momentarily (with some component going to 100% CPU usage for a few seconds). The effect is fairly obvious - Konqueror does not draw to the screen, and if you minimise and then restore it, the window is not redrawn.

This behaviour happens whenever you go to a HTTP URL. Bizarrely, it does not always occur. It happens both on my machine (KDE 3.1.3, everything compiled from sources) and on the machines in the lab they have here (running 3.0.something, perhaps 3.0.5).

This occurs whether you set the proxy file address ("Specified script file") either to a HTTP URL where you can get the script, or to a file URL (eg. /home/lwithers/proxy.config).

The proxy file in question is:

function FindProxyForURL(url, host)
{
  // resolve the host part of the URL -> IP once (minimises DNS lookups)

  var hostIp = dnsResolve(host);


  // examine the request to determine how the browser should fetch it

  if (
    // request for local (inside Reading network) or loopback - go direct

    isInNet(hostIp, "127.0.0.0", "255.0.0.0") || 
    isInNet(hostIp, "134.225.0.0", "255.255.0.0") || 
    isInNet(hostIp, "192.133.244.0", "255.255.255.0") ||
    isInNet(hostIp, "192.100.154.0", "255.255.255.0") ||
    isInNet(hostIp, "192.171.166.0", "255.255.255.0") ||
    isInNet(hostIp, "10.0.0.0", "255.0.0.0") ||
    isInNet(hostIp, "172.16.0.0", "255.240.0.0") ||
    isInNet(hostIp, "192.168.0.0", "255.255.0.0")) {
      return "DIRECT";

  } else if (
    // request is for external resource fetchable through the cache

    shExpMatch(url, "http:*") ||
    shExpMatch(url, "HTTP:*") ||
    shExpMatch(url, "[hH][tT][tT][pP]:*") ||
    shExpMatch(url, "https:*") ||
    shExpMatch(url, "HTTPS:*") ||
    shExpMatch(url, "[hH][tT][tT][pP][sS]:*")) {
      // the list of proxies below is dynamically constructed

      return "PROXY wwwcache.rdg.ac.uk:8080; PROXY wwwcache1.rdg.ac.uk:8080";

  } else {
    // some other sort of request - go direct

    return "DIRECT";
  }
}

Please let me know if there are any other tests you need. I am capable of recompiling KDE with whatever options/flags you need, and can also use ethereal et al. to find out what is happening on the network.
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