Web API cross-domain issues

Workaround:

1. Web. config

<system.webserver>    <handlers>      <Removename= "extensionlessurlhandler-integrated-4.0" />      <Removename= "Optionsverbhandler" />      <Removename= "Traceverbhandler" />      <Addname= "extensionlessurlhandler-integrated-4.0"Path="*."verb="*"type= "System.Web.Handlers.TransferRequestHandler"Precondition= "integratedmode,runtimeversionv4.0" />    </handlers>    <Httpprotocol>      <customheaders>        <!--<add name= "Access-control-allow-origin" value= "http://xxx.com, http://yyy.com"/> -        <Addname= "Access-control-allow-origin"value="*" />        <Addname= "Access-control-allow-methods"value= "GET, POST, PUT, DELETE" />      </customheaders>    </Httpprotocol>  </system.webserver>

<add name= "Access-control-allow-origin" value= "*"/><add name= "Access-control-allow-methods" value= "GET, POST, PUT, DELETE "/>
Specify Web site

<add name= "Access-control-allow-origin" value= "http://xxx.com, http://yyy.com"/>

2,System. Web. Http. Cors

3. Expansion

Web API cross-domain issues