private Response requireJSON(IHTTPSession session){
  final Map<String,String> headers=session.getHeaders();
  if (!APPLICATION_JSON.equals(headers.get(CONTENT_TYPE))) {
    return newFixedLengthResponse(Response.Status.NOT_ACCEPTABLE,MIME_PLAINTEXT,"Set content-type to application/json");
  }
 else {
    return null;
  }
}

private Response requireJSON ( IHTTPSession session ) { final Map < String , String > headers = session . getHeaders ( ) ; if ( ! APPLICATION_JSON . equals ( headers . get ( CONTENT_TYPE ) ) ) { return newFixedLengthResponse ( Response . Status . NOT_ACCEPTABLE , MIME_PLAINTEXT , "Set content-type to application/json" ) ; } else { return null ; } }
ensures that the supplied data has the " content - type " set to json
