Proxy error #12

Thanks for writing this. none other proxies work
Seeing the error below. Any clue whats going wrong?

19/02/27 21:29:26 http: proxy error: net/http: request canceled
2019/02/27 21:29:29 http: proxy error: EOF
2019/02/27 21:30:03 http: proxy error: EOF
2019/02/27 21:30:39 http: proxy error: EOF