title: HTTP content encoding, base64
body: <p>Is there any way to know if the message body of an HTTP response is encoded with Base64?</p>
  
  <p>I learnt that content-transfer-encoding is not part of HTTP header. </p>
  
  <p>So, which HTTP header indicates that the content is encoded with Base64? I think Content-encoding is only used for compressions. </p>