code: public Result doNotCacheContent() {
          
          addHeader(CACHE_CONTROL, CACHE_CONTROL_DEFAULT_NOCACHE_VALUE);
          addHeader(DATE, DateUtil.formatForHttpHeader(System.currentTimeMillis()));
          addHeader(EXPIRES, DateUtil.formatForHttpHeader(0L));
          
          return this;
          
      }
docs: This function sets
  
  Cache-Control: no-cache, no-store
  Date: (current date)
  Expires: 1970
  
  => it therefore effectively forces the browser and every proxy in between
  not to cache content.
  
  See also https://devcenter.heroku.com/articles/increasing-application-performance-with-http-cache-headers
  
  @return this result for chaining.