How to add Access-Control-Allow-Origin?

Question

I am getting the following error when I call my webservice method.

Origin http://localhost:4165 is not allowed by Access-Control-Allow-Origin.

Answer 1

I have found the answer for my question. Just add the following to your web.config file

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

Also if you dont want it to be set up globally, then you can add it to your action method alone as below:

[WebMethod]
public string HelloWorld()
{
    HttpContext.Response.Headers.Add("Access-Control-Allow-Origin", "*");
    return "Hello User";
}