For some reason Squid is passing along my real UserAgent: User-Agent: Mozilla/5.0 (Windows NT 6.1; rv:17.0) Gecko/20100101 Firefox/17.0 ... rather than the one I'm telling it to pass along: request_header_replace User-Agent Mozilla/5.0 (compatible; Goog1ebot/2.1; +http://www.google.com/bot.html) Anyone know why?