var host = new ServiceHost(typeof(Service), new Uri("http://localhost:8732/Design_Time_Addresses/Service/"));
host.AddServiceEndpoint(typeof(IService), new WebHttpBinding(), "http://localhost:8732/Design_Time_Addresses/Service/http");
host.Description.Endpoints.Find(new Uri("http://localhost:8732/Design_Time_Addresses/Service/http")).Behaviors.Add(new WebHttpBehavior());
host.Open();
// ...

[ServiceContract]
public interface IService {
	[OperationContract, WebGet(UriTemplate = "A")]
	string A();
	[OperationContract, WebGet(UriTemplate = "B")]
	string B();
}
// ...

[ServiceBehavior(ConcurrencyMode = ConcurrencyMode.Multiple, InstanceContextMode = InstanceContextMode.PerSession, UseSynchronizationContext = false)]
public class Service : IService {
	public string A() {
		Console.WriteLine("Hello from A, " + Thread.CurrentThread.ManagedThreadId.ToString());
		Thread.Sleep(20000);
		return "";
	}

	public string B() {
		Console.WriteLine("Hello from B, " + Thread.CurrentThread.ManagedThreadId.ToString());
		Thread.Sleep(20000);
		return "";
	}
}