Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for monitoring capability to process web traffic. At various times, a web proxy announces a most specific route that is received by multiple clients configured to send web traffic for an address to a received most specific route to the address. The web proxy processes web traffic received from one of the clients as a result of announcing the route. When the web proxy determines a decrease in processing capability of the web proxy, the web proxy ceases to announce the most specific route such that one or more of the clients direct web traffic for the address to an alternative less specific route.