title: How to remove the content type header from kafka messages produced by the spring cloud stream app starter sources
body: <p>For twitter source it is creating a 30 bit header for each kafka messages if we use custom kafka consumer other than <code>@StreamListener</code> (Sink).
  <code>@StreamListener</code> sends the messages correctly to the annotated method (no header). The problem is for each source the header size varies.
  So how can I dynamically understand the header size of the messages since I'm using custom kafka consumer.?
  Or How can I remove the header for each message.?</p>
  
  <p><strong>UPDATE:-</strong></p>
  
  <p>Please find below the message received in <code>kafka-console-consumer</code> while using a TCP Source.</p>
  
  <pre><code>�
    contentType"application/octet-stream"hello world
  </code></pre>
  
  <p>I just need to get the message only. In this case, hello world</p>