在为Web API 1，.net 4.0启用CORS时出现问题

问题描述

我需要为我的Web API启用CORS，并且不能升级到Framework 4.5.我试图将以下内容添加到我的Web.config中，以查看它是否有效，但没有成功

I need to enable CORS for my Web API and I can't upgrade to Framework 4.5.I've tried to add the following to my Web.config to see if it worked, but it didn't:

<add name="Access-Control-Allow-Origin" value="*" />
<add name="Access-Control-Allow-Headers" value="Accept,Content-Type,X-Requested-With"/>

我正在从以下位置访问URL http://localhost:8484/api/values/ ajax呼叫

I am accessing the URL http://localhost:8484/api/values/ from ajax call

并出现以下错误

推荐答案

我通过charanjit singh找到了这个简单的解决方案.如果您对旧的Visual Studio 2010，.Net 4.0以及Web api 1有所了解，它的效果特别好.基本上将此功能添加到您的Global.asax.cs

I found this simple solution by charanjit singh.It worked nicely especially if you are stuck with older visual studio 2010 , on .Net 4.0 and of course web api 1.Basically add this function to your Global.asax.cs

protected void Application_BeginRequest(object sender, EventArgs e)

{

    HttpContext.Current.Response.AddHeader("Access-Control-Allow-Origin", "*");
    if (HttpContext.Current.Request.HttpMethod == "OPTIONS")
    {
        HttpContext.Current.Response.AddHeader("Access-Control-Allow-Methods",
                     "GET, POST, PUT, DELETE");
        HttpContext.Current.Response.AddHeader("Access-Control-Allow-Headers",
                     "Content-Type, Accept");
        HttpContext.Current.Response.End();
     }
}

参考链接:请注意，您必须滚动至底部注释才能找到答案. http://www.codeguru.com/csharp/.net/net_asp/using-cross-origin-resource-sharing-cors-in-asp.net-web-api.html

ref. links: note you must scroll to the bottom comments for the answer.http://www.codeguru.com/csharp/.net/net_asp/using-cross-origin-resource-sharing-cors-in-asp.net-web-api.html

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