anchor.diff:   */
   abstract class HttpServer implements Stream<HttpRequest> {
     /**
  -   * Set and get the default value of the `Server` header for all responses
  -   * generated by this [HttpServer]. By default, it's disabled.
  -   *
  -   * If the serverHeader is set to `null`, no default `Server` header will be
  -   * added to each response.
  +   * Get and set the default value of the `Server` header for all responses
  +   * generated by this [HttpServer].
  +   *
  +   * If [serverHeader] is `null`, no `Server` header will be added to each
  +   * response.
  +   *
  +   * The default value is `null`.
      */
     String serverHeader;
   
  
positive.code:  * Use [bindSecure] to create an HTTPS server.
   *
   * The server presents a certificate to the client. In the following
   * example, the certificate is named `localhost_cert` and comes from 
   * the database found in the `pkcert` directory.
   * 
   *     import 'dart:io';
   *     import "dart:isolate";
   *
  
negative.code:  * The server sends its response to the client by writing to the
   * HttpResponse object.
   *
   * ## Writing the response
   *
   * This class implements [IOSink].
   * After the header has been set up, the methods
  