autoproxy

Autoproxy is a software component often found in web browsers or as a standalone application that automates the configuration of proxy servers for internet access. Instead of manually entering proxy server addresses and port numbers, autoproxy allows users or applications to discover and apply proxy settings automatically. This is typically achieved through standardized protocols.

One common method is the Proxy Auto-Configuration (PAC) file. A PAC file is a JavaScript file that contains a function to determine whether a web request should be made directly or through a proxy server. When a browser is configured to use a PAC file, it fetches the file and executes the JavaScript logic for each URL it attempts to access. This allows for complex proxy rules, such as using different proxies for different domains or at different times.

Another mechanism is Web Proxy Auto-Discovery (WPAD). WPAD uses network protocols like DHCP or DNS to locate a PAC file on the network. When enabled, a client device will broadcast a request for proxy information, and the network can respond with the location of a PAC file. This simplifies network administration by allowing centralized control over proxy settings for all devices on the network.

Autoproxy simplifies internet access, especially in corporate or managed network environments where proxy servers are mandatory. It enhances user experience by eliminating the need for manual configuration and ensures that network policies regarding internet access are consistently applied.