Imports github.com/gorilla/websocket github.com/refraction-networking/utls github.com/useflyent/fhttp github.com/useflyent/fhttp/http2 golang.org/x/net/proxy Standard library imports bufio context crypto/sha256 crypto/tls encoding/base64 encoding/json errors flag fmt io io/ioutil log net net/url os runtime strconv strings sync time