Webapi 跨域 解决解决错误No 'Access-Control-Allow-Origin' header is present on the requested resource 问题
首先是web端(http://localhost:53784) 请求 api(http://localhost:81/api/)时出现错误信息:
查看控制台会发现错误：XMLHttpRequest cannot load http://localhost:81/api/. No ‘Access-Control-Allow-Origin‘ header is present on the requested resource. Origin ‘http://localhost:53784‘ is therefore not allowed access.
这时会发现并没有阻止请求的发送，而是阻止了不同源请求的响应。也就是说请求没有问题，问题出在了响应。那么如何对指定的源开放访问？？？
第一步:首先在工具里面打开输入；Install-Package Microsoft.AspNet.WebApi.Cors 回车。
第二步：等第一步完成后 打开App_Start/WebApiConfig.cs. 添加一下代码: config.EnableCors();
第三步:在需要访问的Controlls上面加这样的属性: [EnableCors(origins: "http://localhost:53784", headers: "*", methods: "*")]
现在可以再试试看看效果。如果可以请给个赞 希望帮助到更多的人。
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