AspNetCore.SignalR 2.1和CORS [英] AspNetCore.SignalR 2.1 and CORS

问题描述

我将SignalR-Service迁移到新的AspNetCore.SignalR(2.1预览版)，现在我遇到了CORS问题.我将永远不会从同一来源访问该服务，因此通常需要禁用CORS.

I'm migrating our SignalR-Service to the new AspNetCore.SignalR (2.1 preview) and now I get problems with CORS. I will never access the service from the same origin, so I need to disable CORS in general.

我有以下CORS政策

services.AddCors(
            options => options.AddPolicy("AllowCors",
                builder =>
                {
                    builder
                        .AllowAnyOrigin()
                        .AllowCredentials()
                        .AllowAnyHeader()
                        .AllowAnyMethod();
                })
        );

(来自其他来源的WebApi-Controller调用在这些策略下工作正常)

使用SignalR for AspNetCore的旧预览包(AspNetCore.SignalR.Server)，我没有任何问题，但是现在，我的测试客户端出现了一些http-405，这似乎与CORS有关.

With the old preview package of SignalR for AspNetCore (AspNetCore.SignalR.Server) I don't got any problems but now, my test client got some http-405 which seems like an issue with CORS.

SignalR是否可能有额外的CORS配置，还是我需要允许其他内容吗?

Is there maybe a extra CORS configuration for SignalR, or do I need to allow something else?

修改: 我创建了一个全新的/干净的示例项目，没有任何特殊的中间件，以检查错误是否在此发生，并且确实如此.

Edit: I created a fresh/clean sample project without any special middleware to check If the error happens here and it does.

示例Web应用程序| startup.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;
using Microsoft.Extensions.Options;
using WebApplication1.HUBs;

namespace WebApplication1
{
    public class Startup
    {
        public Startup(IConfiguration configuration)
        {
            Configuration = configuration;
        }

        public IConfiguration Configuration { get; }
        public void ConfigureServices(IServiceCollection services)
        {
            services.AddCors(
                options => options.AddPolicy("AllowCors",
                    builder =>
                    {
                        builder
                            .AllowAnyOrigin()
                            .AllowCredentials()
                            .AllowAnyHeader()
                            .AllowAnyMethod();
                    })
            );
            services.AddMvc();
            services.AddSignalR(options =>
            {
            });
        }
        public void Configure(IApplicationBuilder app, IHostingEnvironment env)
        {
            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }

            app.UseCors("AllowCors");
            app.UseMvc();
            app.UseSignalR(routes =>
            {
                routes.MapHub<TestHub>("/test");
            });
        }
    }
}

示例Winforms应用程序

        private HubConnection _hubConnection;
    private void button1_Click(object sender, EventArgs e)
    {
        var connection = new HubConnectionBuilder().WithUrl("http://localhost:63771/test")
            .WithConsoleLogger()
            .WithTransport(Microsoft.AspNetCore.Sockets.TransportType.WebSockets)
            .Build();
        connection.StartAsync();
    }

示例Winforms应用程序控制台输出

fail: Microsoft.AspNetCore.Sockets.Client.HttpConnection[8]
   01/10/2018 15:25:45: Failed to start connection. Error getting negotiation response from 'http://localhost:63771/test'.
System.Net.Http.HttpRequestException: Response status code does not indicate success: 405 (Method Not Allowed).
   bei System.Net.Http.HttpResponseMessage.EnsureSuccessStatusCode()
   bei Microsoft.AspNetCore.Sockets.Client.HttpConnection.<Negotiate>d__42.MoveNext()

推荐答案

尝试像这样在app.UseMvc()顶部移动app.UseSignalR()

Try to move app.UseSignalR() on top of app.UseMvc() like this

app.UseCors("AllowCors");
app.UseSignalR(routes =>
    {
        routes.MapHub<TestHub>("/test");
    });
app.UseMvc();

这篇关于AspNetCore.SignalR 2.1和CORS的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！