web api 跨域请求

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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>