Imports gitlab.com/yawning/obfs4.git/common/log gitlab.com/yawning/obfs4.git/common/socks5 gitlab.com/yawning/obfs4.git/transports gitlab.com/yawning/obfs4.git/transports/base gitlab.torproject.org/tpo/anti-censorship/pluggable-transports/goptlib golang.org/x/net/proxy Standard library imports bufio encoding/base64 errors flag fmt io io/ioutil log net net/http net/http/httputil net/url os os/signal path runtime strconv sync syscall time