title: how set Header in a process in Apache Camel
body: <p>I want to change my header content-type from text/html to application/json.
  my current header is : {CamelHttpMethod=POST,, CONTENT_TYPE=application/json}</p>
  
  <p>and I want to  remove  Content-Type=text/html; charset=UTF-8 by setting header in a process like:</p>
  
  <pre><code>   public void process(Exchange exchange) throws Exception {
  String mainBody = exchange.getIn().getBody().toString();
  
  JsonReader reader = Json.createReader(new StringReader(mainBody));
  JsonObject body = reader.readObject();     
  reader.close();
  exchange.getIn().setHeaders(exchange.CONTENT_TYPE, simple("application/json"));
  /System.out.println("your header" + exchange.getIn().getHeaders());
  exchange.getIn().setBody(body.getJsonObject("API3"));
   }
  </code></pre>
  
  <p>}</p>
  
  <p>is it possible?</p>