KongAuthHttpClientHandler.cs

public class KongAuthHttpClientHandler : HttpClientHandler
{
    protected override async Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
    {
        var kongUrl = "http://localhost:8000/";
        
        request.RequestUri = new Uri(kongUrl + request.RequestUri.PathAndQuery);

        request.Headers.Add("ApiKey", "Rm9vYmFy");

        request.Headers.Host = "requestb.in";

        return await base.SendAsync(request, cancellationToken);
    }
}