When launching the site, it must work correctly on any device and in accordance with the location of the user viewing the content. Therefore, special software and proxies are used to test the operability. In this case, the proxy replaces the IP and other parameters of the user-agent of the polling program, which allows you to receive data on whether everything will be fine with the site when it is opened in different simulated conditions. Also, such a substitution is useful when setting up automatic scripts that monitor the availability of sites and the load on them, which is an important part of the administration and one of the elements of preventing DDoS attacks.
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