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Important
Optimizely added authentication to an endpoint that could be used maliciously. If you see unauthorized exceptions when making requests to integration-related endpoints, you can use the class WebApiClientSession available in Insite.Common.
var webApiClient = new WebApiClientSession(this.SiteConnection.Url.AbsoluteUri);
if (!webApiClient.AuthenticateClient(this.SiteConnection.UserName, this.SiteConnection.Password))
{
    throw new Exception($"Failed to authenticate to Web API with user: {this.SiteConnection.UserName}");
}
var httpClient = webApiClient.GetClient()