A Large-scale Analysis of Content Modification by Open HTTP Proxies

Abstract

Open HTTP proxies offer a quick and convenient solution for routing web traffic towards a destination. In contrast to more elaborate relaying systems, such as anonymity networks or VPN services, users can freely connect to an open HTTP proxy without the need to install any special software. Therefore, open HTTP proxies are an attractive option for bypassing IPbased filters and geo-location restrictions, circumventing content blocking and censorship, and in general, hiding the client's IP address when accessing a web server. Nevertheless, the consequences of routing traffic through an untrusted third party can be severe, while the operating incentives of the thousands of publicly available HTTP proxies are questionable.