1. A method of testing a plurality of web resources in a distributed client-server computer network, the method comprising: receiving, by a proxy server computer, an HTTP (hypertext transport protocol) request for a web resource, the HTTP request transmitted from an Internet Protocol (IP) address associated with a port of a testing computer, the port associated with the proxy server, the HTTP request including a plaintext domain name associated with the web resource, the testing computer coupled to the proxy server in an IP network; and transmitting the HTTP request, to the testing computer from which the HTTP request was received, by the proxy server based on the IP address associated with the port of the testing computer, the HTTP request received from the proxy server including the plaintext domain name associated with the web resource.