Use web proxy auto-discovery in Safari

Unlike most browsers, Safari doesn't have a setting to use WPAD (web proxy auto-discovery) in OS X. However, there is a way to ask Safari to automatically detect the network's proxy settings, but only if your network administrator has configured WPAD on your network.

This auto-detect feature works through DNS. The browser looks for a host named "wpad" and if it exists, loads its settings by accessing a file named "wpad.dat" via HTTP. To use DNS-based WPAD with Safari on OS X, follow these steps:

In Safari, choose Safari » Preferences
Click on the Advanced icon
Click on the Proxies » Change Settings button
In the Configure Proxies dropdown menu, select Using A PAC File
In the PAC File URL field, enter http://wpad/wpad.dat
Click on OK
Click on Apply

Again, this is only helpful if your network administrator has set up a proxy to be auto-configured. If you're on a network that doesn't have such a setup, Sa...