Christian Haschek’s new web service Proxy Checker is now available to test the security of proxy servers. He has expanded his analysis to over 25,000 proxies. Here are his findings about the use of the technique he described in his previous post Why are free proxies free? Here are my findings about how free proxies can be used to check for altered content on the web. I don’t provide you with a proxy list but it shouldn’t be hard to get one. I’m currently developing an open source web service which is based on this function.”]
Source: https://blog.haschek.at/2015-analyzing-443-free-proxies