增加CORS

https://stackoverflow.com/questions/25437405/cors-access-for-httplistener

src/JT808.Gateway/JT808HttpServer.cs

@@ -76,6 +76,15 @@ namespace JT808.Gateway
                             context.Http404();
                             continue;
                         }
+                        // 增加CORS
+                        // https://stackoverflow.com/questions/25437405/cors-access-for-httplistener
+                        if (context.Request.HttpMethod == HttpMethod.Options.Method)
+                        {
+                            context.Response.AddHeader("Access-Control-Allow-Headers", "Content-Type, Accept, X-Requested-With");
+                            context.Response.AddHeader("Access-Control-Allow-Methods", "GET, POST");
+                            context.Response.AddHeader("Access-Control-Max-Age", "1728000");
+                        }
+                        context.Response.AppendHeader("Access-Control-Allow-Origin", "*");
                         if (authorization.Authorization(context, out var principal))
                         {
                             await ProcessRequestAsync(context, principal);