Web API 跨域

1. NuGet下載

microsoft.aspnet.webapi.cors

2 . Web API 路由中

config.EnableCors(new EnableCorsAttribute());

A.web.config (AB任選其一)

一般瀏覽器的跨域（寫在web.config 的 <system.webServer>下）


 <!--跨域部分設置-->
    <httpProtocol>
      <customHeaders>
        <add name="Access-Control-Allow-Origin" value="*" />
        <add name="Access-Control-Allow-Headers" value="Content-Type" />
        <add name="Access-Control-Allow-Methods" value="GET, POST, PUT, DELETE, OPTIONS" />
      </customHeaders>
    </httpProtocol>
-----------------------------------------------------------

B . Api控制器中(AB任選其一)

        谷歌瀏覽器跨域，（寫在api控制器中）
        /// <summary>
        /// HTTP 200 response with empty body
        /// </summary>
        /// <returns></returns>
        public string Options()
        {
            return null;
        }
-----------------------------------------------------------
        using System.Web.Http.Cors; 

        [EnableCors(origins: "*", headers: "*", methods: "*")]  
        public class ValuesController : ApiController  
        {  

        }  

3.api控制器中(2,3任選其一)

//全部通過
config.EnableCors(new EnableCorsAttribute("*", "*", "*"));