Imports github.com/aliyun/aliyun-oss-go-sdk/oss/credentials github.com/aliyun/aliyun-oss-go-sdk/oss/readers github.com/aliyun/aliyun-oss-go-sdk/oss/retry github.com/aliyun/aliyun-oss-go-sdk/oss/signer github.com/aliyun/aliyun-oss-go-sdk/oss/transport Standard library imports bytes context encoding/xml fmt io net/http net/url reflect runtime strings sync time