解决跨域问题

AutoTurnOver/Models/CorsMiddleware.cs

+using Microsoft.AspNetCore.Cors.Infrastructure;
+using Microsoft.AspNetCore.Http;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+
+namespace AutoTurnOver.Models
+{
+    public class CorsMiddleware
+    {
+        private readonly RequestDelegate next;
+
+        public CorsMiddleware(RequestDelegate next)
+        {
+            this.next = next;
+        }
+        public async Task Invoke(HttpContext context)
+        {
+            if (context.Request.Headers.ContainsKey(CorsConstants.Origin))
+            {
+                context.Response.Headers.Add("Access-Control-Allow-Origin", context.Request.Headers["Origin"]);
+                context.Response.Headers.Add("Access-Control-Allow-Methods", "PUT,POST,GET,DELETE,OPTIONS,HEAD,PATCH");
+                context.Response.Headers.Add("Access-Control-Allow-Headers", context.Request.Headers["Access-Control-Request-Headers"]);
+                context.Response.Headers.Add("Access-Control-Allow-Credentials", "true");
+
+                if (context.Request.Method.Equals("OPTIONS"))
+                {
+                    context.Response.StatusCode = StatusCodes.Status200OK;
+                    return;
+                }
+            }
+
+            await next(context);
+        }
+    }
+}

AutoTurnOver/Startup.cs

@@ -3,6 +3,7 @@ using System.Collections.Generic;
 using System.Linq;
 using System.Threading.Tasks;
 using AutoTurnOver.Common;
+using AutoTurnOver.Models;
 using Microsoft.AspNetCore.Builder;
 using Microsoft.AspNetCore.Hosting;
 using Microsoft.AspNetCore.Http;
@@ -89,7 +90,7 @@ namespace AutoTurnOver
 
             // Shows UseCors with CorsPolicyBuilder.
             //app.UseCors("AllowSpecificOrigin");
-
+            app.UseMiddleware<CorsMiddleware>();
             app.UseStaticHttpContext();
         }
     }