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:  * 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
  
negative.code:  * * HttpServer is a Stream. Refer to the [Stream] class for information
   * about the streaming qualities of an HttpServer.
   * Pausing the subscription of the stream, pauses at the OS level.
   *
   * * The [http_server](https://pub.dartlang.org/packages/http_server)
   * package on pub.dartlang.org contains a set of high-level classes that,
   * together with this class, makes it easy to provide content through HTTP
  