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              Network A: 172.16.0.0/20

                 _.-"""""""""""""""""-._
               .'                       `.
              /                           \
            |    Proxy A1: 172.16.0.10    |
            |                             |
            |    Proxy A2: 172.16.0.20    |
             \                           /
              `._                     _.'\
                 `-.................-'    \
                                           \
                                            \  Network B: 172.16.16.0/20
                                             \
                                              \ _.-"""""""""""""""""-._
                                              .'                       `.
                                             /                           \
                                            |                             |
                                            |    Proxy B: 172.16.16.10    |
                                            |                             |
                                             \                           /
                                              `._                     _.'
                                              /  `-.................-'
                                             /
                                            /
              Network C: 172.16.32.0/20    /
                                          /
                _.-"""""""""""""""""-._  /
              .'                       `.
             /                           \
            |                             |
            |    Proxy C: 172.16.32.10    |
            |                             |
             \                           /
              `._                     _.'
                 `-.................-'

                                        Figure 1.

    The proxies have the following connectivity:

     Proxy A1       Internet connectivity
     Proxy A2       Internet connectivity
     Proxy B        parents with proxy A1 and A2
     Proxy C        parents with proxy B and A1

    Clients in the three networks need to get the following proxy
    configuration:

     172.16.0.0/20  Half of the clients connect to proxy A1 and use proxy A2
                    as fallback, the other half use proxy A2 with A1 as
                    fallback.
     172.16.16.0/20 Clients use proxy B with proxy A2 as fallback.
     172.16.32.0/20 Clients use proxy C with proxy B as fallback.

    For secure HTTP traffic special rules apply. Because this traffic is not
    cached all clients connect to proxy A1 and A2 directly spreading the
    load equally.

    This is how the proxyconf.ini looks:

     [proxy]
     172.16.0.0/20=(172.16.0.10:3128,172.16.0.20:3128)
     172.16.16.0/20=172.16.16.10:3128,172.16.0.20:3128
     172.16.32.0/20=172.16.32.10:3128,172.16.16.10:3128

     [https]
     172.16.0.0/16=(172.16.0.10:3128,172.16.0.20:3128)

EXTRA OPTIONS
    It is possible to add additional noproxy hosts in the 'Autoconfigure
    URL' in the browser. This way a local webserver can be tested without
    losing the benefits of the proxy config. The following string must be
    entered in the 'Autoconfigure URL'.

    http://proxyconf.some.domain/?noproxy=hostname.some.domain

    Multiple hostnames are specified using a comma as separator.

    http://proxyconf.some.domain/?noproxy=fqhn1,fqhn2

DEBUGGING
    The proxy config service can be called with a debug option. Type the
    following URL in a browser:

    http://proxyconf.some.domain/?debug=1&ipaddr=172.16.0.100

    The script will generate a html page which contains the settings of all
    variables and displays the script it sends to the browser for the
    specified IP address.

AUTHOR
    Patrick Schoo <pschoo@playbeing.com>

    Originally written by Bert Driehuis <driehuis@playbeing.org>