支持flutter调用

lib/base/webserver/WebServer.dart

@@ -1,3 +1,5 @@
+import 'dart:io';
+
 abstract class WebServer {
   static late WebServer _webServer;
 
@@ -24,9 +26,26 @@ enum HttpMethod {
   ;
 }
 
+enum HttpResponseType {
+  HTML("text/html; charset=utf-8"),
+  TEXT("text/plain; charset=utf-8"),
+  XML("text/xml; charset=utf-8"),
+  JSON("application/json; charset=utf-8"),
+  BINARY("application/octet-stream"),
+  ;
+
+  final String type;
+
+  const HttpResponseType(this.type);
+}
+
 class RequestMapping {
   final HttpMethod method;
   final String path;
+  final HttpResponseType responseType;
 
-  const RequestMapping({this.method = HttpMethod.ALL, required this.path});
+  const RequestMapping(
+      {this.method = HttpMethod.ALL,
+      required this.path,
+      this.responseType = HttpResponseType.JSON});
 }