Allow all headers to be set as Response headers (#142)

* Allow all headers to be set as Response headers

* RunTestDifferentPort

* Fix Proxy_Should_change_absolute_location_header_in_proxied_response test

* Fix OwinResponseMapper

* Fix test

* 1.0.3.18

examples/WireMock.Net.Console.Proxy.NETCoreApp2/Program.cs

@@ -1,4 +1,10 @@
-using Newtonsoft.Json;
+using System.Linq;
+using System.Net.Http;
+using System.Threading;
+using System.Threading.Tasks;
+using Newtonsoft.Json;
+using WireMock.RequestBuilders;
+using WireMock.ResponseBuilders;
 using WireMock.Server;
 using WireMock.Settings;
 
@@ -8,6 +14,9 @@ namespace WireMock.Net.Console.Proxy.NETCoreApp2
     {
         static void Main(string[] args)
         {
+            RunTestDifferentPort().Wait(20000); // prints "1"
+            RunTestDifferentPort().Wait(20000); // prints "1"
+
             var server = FluentMockServer.Start(new FluentMockServerSettings
             {
                 Urls = new[] { "http://localhost:9091", "https://localhost:9443" },
@@ -32,5 +41,22 @@ namespace WireMock.Net.Console.Proxy.NETCoreApp2
             System.Console.ReadKey();
             server.Stop();
         }
+
+        private static async Task RunTestDifferentPort()
+        {
+            var server = FluentMockServer.Start();
+
+            server.Given(Request.Create().WithPath("/").UsingGet())
+                .RespondWith(Response.Create().WithStatusCode(200).WithBody("Hello"));
+
+            Thread.Sleep(1000);
+
+            var response = await new HttpClient().GetAsync(server.Urls[0]);
+            response.EnsureSuccessStatusCode();
+
+            System.Console.WriteLine("RunTestDifferentPort - server.LogEntries.Count() = " + server.LogEntries.Count());
+
+            server.Stop();
+        }
     }
 }