Distinguish between html and json results during registration.

Json doesn't like getting a 203 - it prefers the regular response with a
ReferrerUrl

Author: jeffgabhart

src/ServiceStack.ServiceInterface/Auth/RegistrationService.cs

@@ -156,12 +156,19 @@ public object Post(Registration request)
                 };
             }
 
-            if (string.IsNullOrEmpty(request.Continue))
-                return response;
-            
-            return new HttpResult(response) {
-                Location = request.Continue
-            };
+            var isHtml = base.RequestContext.ResponseContentType.MatchesContentType(ContentType.Html);
+            if (isHtml)
+            {
+                if (string.IsNullOrEmpty(request.Continue))
+                    return response;
+
+                return new HttpResult(response)
+                {
+                    Location = request.Continue
+                };
+            }
+
+            return response;
         }
 
         public UserAuth ToUserAuth(Registration request)

tests/ServiceStack.Common.Tests/OAuth/RegistrationServiceTests.cs

@@ -170,9 +170,9 @@ public void Requires_unique_UserName_and_Email()
 		}
 
 		[Test]
-		public void Registration_with_Continue_returns_302_with_Location()
+		public void Registration_with_Html_ContentType_And_Continue_returns_302_with_Location()
 		{
-			var service = GetRegistrationService();
+			var service = GetRegistrationService(null, null, ContentType.Html);
 
 			var request = GetValidRegistration();
 			request.Continue = "http://localhost/home";
@@ -187,7 +187,7 @@ public void Registration_with_Continue_returns_302_with_Location()
 		[Test]
 		public void Registration_with_EmptyString_Continue_returns_RegistrationResponse()
 		{
-			var service = GetRegistrationService();
+			var service = GetRegistrationService(null, null, ContentType.Html);
 
 			var request = GetValidRegistration();
 			request.Continue = string.Empty;
@@ -197,5 +197,20 @@ public void Registration_with_EmptyString_Continue_returns_RegistrationResponse(
 			Assert.That(response as HttpResult, Is.Null);
 			Assert.That(response as RegistrationResponse, Is.Not.Null);
 		}
+
+		[Test]
+		public void Registration_with_Json_ContentType_And_Continue_returns_RegistrationResponse_with_ReferrerUrl()
+		{
+			var service = GetRegistrationService(null, null, ContentType.Json);
+
+			var request = GetValidRegistration();
+			request.Continue = "http://localhost/home";
+
+			var response = service.Post(request);
+
+			Assert.That(response as HttpResult, Is.Null);
+			Assert.That(response as RegistrationResponse, Is.Not.Null);
+			Assert.That(((RegistrationResponse)response).ReferrerUrl, Is.EqualTo("http://localhost/home"));
+		}
 	}
 }