15. An apparatus-implemented method comprising: receiving by a first apparatus comprising a processor, from a web server, first data from a first HTTP response generated by the web server in response to a first HTTP GET request for a first URL generated by a web browser in a second apparatus; and causing the web browser to receive a second HTTP response that differs from the first HTTP response in that the second HTTP response contains data which causes the web browser to generate a second HTTP request in response to a web page received in response to the first HTTP GET request reaching a specified stage of loading in the web browser.
15. An apparatus-implemented method comprising: receiving by a first apparatus comprising a processor, from a web server, first data from a first HTTP response generated by the web server in response to a first HTTP GET request for a first URL generated by a web browser in a second apparatus; and causing the web browser to receive a second HTTP response that differs from the first HTTP response in that the second HTTP response contains data which causes the web browser to generate a second HTTP request in response to a web page received in response to the first HTTP GET request reaching a specified stage of loading in the web browser. 16. A method according to claim 15 , wherein the second HTTP response includes data which causes the web browser to generate the second HTTP request in response to the end of the web page's HTML response having been parsed.