1. Get `pac` file from url
    ```
    $ curl http://proxyconf.glb.nokia.com/proxy.pac > proxy.pac
    ```
2. Determine proxy for url
    ```
    $ pactester -p proxy.pac -u http://example.com 
    PROXY usfraaa-proxy.americas.nsn-net.net:8080; PROXY usfraaa-proxy.americas.nsn-net.net:8080;
    ```
3. Use curl to test access to url
    ```
    $ curl -x usfraaa-proxy.americas.nsn-net.net:8080 http://example.com
    ```