webapi 跨域问题

参考：

给自己做个笔记

 httpcontext.current.response.addheader("access-control-allow-credentials", "true");
 httpcontext.current.response.addheader("access-control-allow-headers", "origin,x-requested-with,content-type");
 httpcontext.current.response.addheader("access-control-allow-methods", "post,get,options");
 httpcontext.current.response.addheader("access-control-allow-origin", "*");

在web.config中添加这段代码

<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>