1、定义一个handler
// Pipelines
HttpMessageHandler affiliateShipmentsPipeline =
HttpClientFactory.CreatePipeline(
new HttpControllerDispatcher(config),
new[] { new AffiliateShipmentsDispatcher() });2、将handler应用在指定的router上
// Routes
routes.MapHttpRoute(
"AffiliateShipmentsHttpRoute",
"api/affiliates/{key}/shipments/{shipmentKey}",
defaults: new { controller = "AffiliateShipments", shipmentKey = RouteParameter.Optional },
constraints: new { key = new GuidRouteConstraint(), shipmentKey = new GuidRouteConstraint() },
handler: affiliateShipmentsPipeline);

HttpRequestMessage request = ConstructRequest(httpMethod, uri, mediaTypes);
request.Headers.Authorization = new AuthenticationHeaderValue(
"Basic",
EncodeToBase64(
string.Format("{0}:{1}", username, password)));private static string EncodeToBase64(string value) {
byte[] toEncodeAsBytes = Encoding.UTF8.GetBytes(value);
return Convert.ToBase64String(toEncodeAsBytes);
}

internal static async Task<HttpResponseMessage> GetResponseAsync(
HttpConfiguration config, HttpRequestMessage request) {using (var httpServer = new HttpServer(config))
using (var client = HttpClientFactory.Create(innerHandler: httpServer)) {return await client.SendAsync(request);
}
}

request.Content = new ObjectContent<ShipmentRequestModel>(
shipmentRequestModel, new System.Net.Http.Formatting.JsonMediaTypeFormatter());

internal static class HttpRequestMessageExtensions {internal static IShipmentService GetShipmentService(this HttpRequestMessage request) {return request.GetServic e<IShipmentService>();
}internal static IMembershipService GetMembershipService(this HttpRequestMessage request) {return request.GetService<IMembershipService>();
}private static TService GetService<TService>(this HttpRequestMessage request) {IDependencyScope dependencyScope = request.GetDependencyScope();
TService service = (TService)dependencyScope.GetService(typeof(TService));return service;
}
}