未设置 CORS 标头

Posted 2023-03-04

【中文标题】未设置 CORS 标头

【英文标题】：CORS header not being set

【发布时间】：2016-04-26 05:25:29

【问题描述】：

我的 Web API 控制器请求中似乎没有任何 CORS 标头。

我目前正在使用 ASP.net 5 - coreclr，并且我已经添加了 Microsoft.AspNet.Cors 6.0.0-rc1-final

public void ConfigureServices(IServiceCollection services)

        services.AddCors(options =>
        
            options.AddPolicy("AllowAll", builder => builder.AllowAnyHeader().AllowAnyMethod().AllowAnyOrigin());
        );

        services.AddMvc();

        services.AddSingleton<ConnectionMultiplexer>(x => ConnectionMultiplexer.Connect("localhost"));
        services.AddScoped<IDatabase>(x => (x.GetService(typeof(ConnectionMultiplexer)) as ConnectionMultiplexer).GetDatabase());
        services.AddScoped<IFitnessStorage, FitnessStorage>();
        services.AddScoped<IFitnessTrackingService, FitnessTrackingService>();



public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory)

        loggerFactory.AddConsole(Configuration.GetSection("Logging"));
        loggerFactory.AddDebug();

        app.UseCors("AllowAll");
        app.UseIISPlatformHandler();
        app.UseStaticFiles();
        app.UseMvc();

我的控制器上没有任何 [EnableCors]，因为 UseCors 应该为每个请求设置它 - AFAIK..

  HTTP/1.1 200 OK
  Date: Wed, 20 Jan 2016 11:24:36 GMT
  Content-Type: application/json; charset=utf-8
  Server: Kestrel
  Transfer-Encoding: chunked

  GET /api/FitnessTrackGroup HTTP/1.1
  Host: localhost:5000
  Connection: keep-alive
  Pragma: no-cache
  Cache-Control: no-cache
  Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
  Upgrade-Insecure-Requests: 1
  User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/47.0.2526.111 Safari/537.36
  DNT: 1
  Accept-Encoding: gzip, deflate, sdch
  Accept-Language: da,en-US;q=0.8,en;q=0.6,nb;q=0.4

【参考方案1】：

如果您的请求不包含 Origin 标头，即同源请求，则 CORS 中间件实际上是一个 noop。它基本上是在第一步中救出...

Chrome 在同源 GET 请求中不包含 Origin 标头...请参阅 Chrome adding Origin header to same-origin request。