Imports github.com/denverdino/aliyungo/common github.com/denverdino/aliyungo/util Standard library imports crypto/hmac encoding/xml crypto/rsa encoding/pem mime crypto crypto/sha1 crypto/md5 net/http/httputil bytes crypto/x509 encoding/base64 encoding/hex errors fmt io io/ioutil log net net/http net/url os path regexp sort strconv strings sync time