ProxyHandler.cs

using System;
using System.Linq;
using System.Net.Http;
using System.Net.Http.Headers;
using System.Threading.Tasks;
using System.Web.Http;
using WebApiProxy.Server.Templates;
//testing ci 1
namespace WebApiProxy.Server
{
    public class ProxyHandler : DelegatingHandler
    {
        private MetadataProvider _metadataProvider;
        HttpConfiguration _config;
        public ProxyHandler(HttpConfiguration config)
        {
            _metadataProvider = new MetadataProvider();
            _config = config;
        }

        protected async override Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, System.Threading.CancellationToken cancellationToken)
        {
            return await Task.Run(() =>
            {
                var metadata = _metadataProvider.GetMetadata(request, _config);

                if (request.Headers.Any(h => h.Key == "X-Proxy-Type" && h.Value.Contains("metadata")))
                {
                    return request.CreateResponse(System.Net.HttpStatusCode.OK, metadata);
                }

                var template = new JsProxyTemplate(metadata);
                var js = new StringContent(template.TransformText());

                js.Headers.ContentType = new MediaTypeHeaderValue("application/javascript");
                js.Headers.Expires = DateTime.Now.AddDays(30).ToUniversalTime();

                var result = new HttpResponseMessage { Content = js }; ;
                result.Headers.CacheControl = CacheControlHeaderValue.Parse("public");
                
                return result;
            });
        }
    }
}