fixes https://github.com/fluent/fluent-plugin-s3/issues/48
fixes https://github.com/fluent/fluent-plugin-s3/issues/48

phstudy/fluent-plugin-azurestorage,cosmo0920/fluent-plugin-azurestorage,inokappa/fluent-plugin-azurestorage,htgc/fluent-plugin-azurestorage