解决asp.net mvc的跨域请求问题

web.config中配置如下内容：

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<system.webServer>

    <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>

    <handlers>

        <remove name="ExtensionlessUrlHandler-Integrated-4.0" />

        <remove name="OPTIONSVerbHandler" />

        <remove name="TRACEVerbHandler" />

        <add name="ExtensionlessUrlHandler-Integrated-4.0" path="*." verb="*" type="System.Web.Handlers.TransferRequestHandler" preCondition="integratedMode,runtimeVersionv4.0" />

    </handlers>

</system.webServer>

 

如果是webapi，还需要在每个controller中添加一个方法：

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public string Options()

{

    return null;

}