title: Setting multiple headers in camel route
body: <p>Is it possible to set multiple exchange headers in camel route using single call to setHeader.</p>
  
  <p>Something like this</p>
  
  <pre><code>&lt;from uri="file://inputdir/?delete=true" /&gt;
  &lt;!-- need to set multiple headers at once(as a comma separated list)--&gt;
      &lt;setHeader headerName="headername"&gt;
          &lt;constant&gt;headerval&lt;/constant&gt;
      &lt;/setHeader&gt;
  &lt;to uri="mock:end"/&gt;
  </code></pre>
  
  <p>Or should I create a custom processor for this?     </p>