Exploring the connection between AngularJS and cross-origin resource sharing in

Why am I struggling with the CORS issue on WebAPI? Isn't it supposed to be accessible by third parties? Can someone clarify why I'm having trouble calling the WebAPI from a different domain? It's a web service, so naturally, it should be on a separate domain!

Even after adding the CORS library and enabling it in my configuration, the issue persists.

Was it really necessary to make two calls just to retrieve information with CORS enabled? Now all my requests will be duplicated!

How can I resolve the CORS problem between AngularJS and WebAPI? I'd appreciate a theoretical explanation as to why I can't call my web service without dealing with CORS. After all, web services are meant to be consumed universally, right?

javascript.netangularjsasp.net-web-apicors

Answer №1

When dealing with CORS issues, it's important to understand that they typically arise on the client-side rather than within the WebAPI itself, especially if the WebAPI and client are on different ports.

If you're working with ASP.NET WebAPI, you'll want to install the Microsoft.Owin.Cors package and set up CORS in the startup configuration of your web server.

In your WebApiConfig.cs file, you can add something like this:

var cors = new EnabledCorsAttribute("", "", "DataServiceVersion,MaxDataServiceVersion");
config.EnableCors(cors);

Web.Config

<httpProtocol>
    <customHeaders>
        <add name="Access-Control-Allow-Origin" value="http://localhost" />
        <add name="Access-Control-Allow-Headers" value="Origin, X-Requested-With, Content-Type, Accept, Cache-Control" />
        <add name="Access-Control-Allow-Credentials" value="true" />
        <add name="Access-Control-Allow-Methods" value="GET, POST, PUT, DELETE, OPTIONS" />
    </customHeaders>
</httpProtocol>

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