I've created a automated test suite for proxy server. From several websites in the internet like https://free-proxy-list.net/ I get many IPs of free proxy servers. I've also created a own Website with JSON API to get HTTP requests header.
All requests mostly differ in values like
X-Proxy-Id. But no proxy server changes the
User-Agent. Its always the User-Agent from the origin, in my case
After researching I know it's technical no problem to do this with a proxy but anyone now why no free http proxy server do it?