anchor.diff:  
     ///The body type, such as 'JSON', 'TEXT' or 'FORM'
     String get bodyType;
  -  
  +
     ///Indicate if this request is multipart
     bool get isMultipart;
   
  
positive.code: 
  /**
   * Parse authorization header from request.
   * 
   */
  Credentials parseAuthorizationHeader() {
    if (request.headers[HttpHeaders.AUTHORIZATION] != null) {
  
negative.code: 
  /**
   * Register a Shelf Handler.
   *
   * The [handler] will be invoked when all interceptors are
   * completed, and no route is found for the requested URL.
   */
  