[2] content-type: binary/octet-stream · Issue #138 · aws/aws-sdk-php ( 版) <https://github.com/aws/aws-sdk-php/issues/138>
[3] amazon s3 - Firefox 29: HTTP "Content-Type" of "binary/octet-stream" is not supported - Stack Overflow ( 版) <http://stackoverflow.com/questions/23797235/firefox-29-http-content-type-of-binary-octet-stream-is-not-supported>
[4] php - imagejpeg causing file type 'binary/octet-stream' in GCS - Stack Overflow ( 版) <http://stackoverflow.com/questions/27661234/imagejpeg-causing-file-type-binary-octet-stream-in-gcs>
[5] aws s3に画像を上げる時はcontent-typeを指定しましょうというメモ - Work Records ( 版) <http://kenjiszk.hatenablog.com/entry/2014/05/08/090733>