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