HttpClient with BaseAddress

Phil Murray picture Phil Murray · Dec 16, 2013 · Viewed 22.7k times · Source

I have a problem calling a webHttpBinding WCF end point using HttpClient and the BaseAddress property.

HttpClient

I created a HttpClient instance specifying the BaseAddress property as a local host endpoint.

enter image description here

GetAsync Call

I then call the GetAsync method passing in the additional Uri inforamtion.

HttpResponseMessage response = await client.GetAsync(string.Format("/Layouts/{0}", machineInformation.LocalMachineName()));

enter image description here

Service endpoint

[OperationContract]
[WebGet(UriTemplate = "/Layouts/{machineAssetName}", ResponseFormat = WebMessageFormat.Json)]
List<LayoutsDto> GetLayouts(string machineAssetName);

Problem

The problem I am having is that the is that /AndonService.svc part of the BaseAddress is being truncated so the resultant call goes to https://localhost:44302/Layouts/1100-00277 rather that https://localhost:44302/AndonService.svc/Layouts/1100-00277 resulting in a 404 Not Found.

Is there a reason the BaseAddress is being truncated in the GetAsync call? How do I get around this?

Answer

Thomas Levesque picture Thomas Levesque · Dec 16, 2013

In the BaseAddress, just include the final slash: https://localhost:44302/AndonService.svc/. If you don't, the final part of the path is discarded, because it's not considered to be a "directory".

This sample code illustrates the difference:

// No final slash
var baseUri = new Uri("https://localhost:44302/AndonService.svc");
var uri = new Uri(baseUri, "Layouts/1100-00277");
Console.WriteLine(uri);
// Prints "https://localhost:44302/Layouts/1100-00277"


// With final slash
var baseUri = new Uri("https://localhost:44302/AndonService.svc/");
var uri = new Uri(baseUri, "Layouts/1100-00277");
Console.WriteLine(uri);
// Prints "https://localhost:44302/AndonService.svc/Layouts/1100-00277"