code: protected HttpBuilder streamOut(InputStream in) {
          StreamResponse resp = new StreamResponse(in);
          RequestContext.setControllerResponse(resp);
          return new HttpBuilder(resp);
      }
docs: Streams content of the <code>reader</code> to the HTTP client.
  
  @param in input stream to read bytes from.
  @return {@link HttpSupport.HttpBuilder}, to accept additional information.