401 Unauthorized error when accessing webapi from angular

I need to capture a user’s domainusername when they access my webapi app. On my dev machine I have my webapi at localhost:10570 and my angularjs website which makes calls to the webservice at localhost:34575.

If I make a call directly to my webapi app everything works fine. I can see the users domain and username and the service returns the requested data as JSON. But if I access my angularjs site and angular makes the call to webapi then I get 401 unauthorized for every call against the service.

In my WebApi app’s web.config I have:

<system.web>
    <compilation debug="true" targetFramework="4.5.2" />
    <httpRuntime targetFramework="4.5.2" />
    <authentication mode="Windows" />
  </system.web>
  <system.webServer>
    <httpProtocol>
  <customHeaders>
    <add name="Access-Control-Allow-Origin" value="http://localhost:34575" />
    <add name="Access-Control-Allow-Methods" value="POST, PUT, DELETE, GET, OPTIONS" />
    <add name="Access-Control-Allow-Headers" value="content-Type, accept, origin, X-Requested-With, Authorization, name" />
    <add name="Access-Control-Allow-Credentials" value="true" />
  </customHeaders>
</system.webServer>

I have this in IIS Express for Visual Studio 2015’s applicationhost.config file:

<location path="MyNamespace.WebAPI">
    <system.webServer>
        <security>
            <authentication>
                <windowsAuthentication enabled="true" />
                <anonymousAuthentication enabled="false" />
            </authentication>
        </security>
    </system.webServer>
</location>

My angularjs site is part of the same solution at “MyNamespace.Client”.

Why does accessing the web service directly work fine, but accessing it via the angular app fail?

Answer

I didn’t realize you have to tell Angular to send your credentials to the server. I just had to change my API calls from:

$http.get(url);

to

$http.get(url, { withCredentials: true });

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