using System;
using System.Net.Http;
using System.Threading;
using System.Threading.Tasks;

namespace WebMVC.Infrastructure
{
    public class HttpClientRequestIdDelegatingHandler
       : DelegatingHandler
    {

        public HttpClientRequestIdDelegatingHandler()
        {
        }

        protected override async Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
        {
            if (request.Method == HttpMethod.Post || request.Method == HttpMethod.Put)
            {
                if (!request.Headers.Contains("x-requestid"))
                {
                    request.Headers.Add("x-requestid", Guid.NewGuid().ToString());
                }
            }
            
            return await base.SendAsync(request, cancellationToken);
        }
    }
}