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