There is quite a list of situations where a proxy checker is required. Like proxies themselves, they can be paid (usually more advanced) and free (usually basic). The basic ones just detect whether this proxy is working or not. Advanced checkers cover thousands of proxies in a matter of minutes and sort them by parameters (accessibility, speed, and so on). However, there is more to proxy checkers than just testing whether this particular server is responding or not. Since proxy servers are complex tools including hardware, software, and web services, they are sensitive both to user details (real location, OS, personal details, subscription, and so on) and to details of entities they want to reach (websites, FTP, messengers, intranets, etc.) There is little guarantee that the proxy you use complies with your requirements or functions as such at all.
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