Cache is disabled for json responses.

NzbDrone.Api/Extensions/CacheHeaderPipeline.cs

@@ -0,0 +1,16 @@
+using Nancy;
+
+namespace NzbDrone.Api.Extensions
+{
+    public static class CacheHeaderPipeline
+    {
+        public static void Handle(NancyContext context)
+        {
+            if (context.Response.ContentType.Contains("json"))
+            {
+                context.Response.Headers.DisableCache();
+
+            }
+        }
+    }
+}

NzbDrone.Api/Extensions/ReqResExtensions.cs

@@ -32,24 +32,27 @@ namespace NzbDrone.Api.Extensions
 
         public static JsonResponse<TModel> AsResponse<TModel>(this TModel model, HttpStatusCode statusCode = HttpStatusCode.OK)
         {
-            return new JsonResponse<TModel>(model, NancySerializer) { StatusCode = statusCode };
+            var response = new JsonResponse<TModel>(model, NancySerializer) { StatusCode = statusCode };
+            response.Headers.DisableCache();
+
+            return response;
         }
 
         public static IDictionary<string, string> DisableCache(this IDictionary<string, string> headers)
         {
-            headers.Add("Cache-Control", "no-cache, no-store, must-revalidate");
+            headers["Cache-Control"] = "no-cache, no-store, must-revalidate";
-            headers.Add("Pragma", "no-cache");
+            headers["Pragma"] = "no-cache";
-            headers.Add("Expires", "0");
+            headers["Expires"] = "0";
 
             return headers;
         }
 
         public static IDictionary<string, string> EnableCache(this IDictionary<string, string> headers)
         {
-            headers.Add("Cache-Control", "max-age=31536000 , public");
+            headers["Cache-Control"] = "max-age=31536000 , public";
-            headers.Add("Expires", "Sat, 29 Jun 2020 00:00:00 GMT");
+            headers["Expires"] = "Sat, 29 Jun 2020 00:00:00 GMT";
-            headers.Add("Last-Modified", "Sat, 29 Jun 2000 00:00:00 GMT");
+            headers["Last-Modified"] = "Sat, 29 Jun 2000 00:00:00 GMT";
-            headers.Add("Age", "193266");
+            headers["Age"] = "193266";
 
             return headers;
         }

NzbDrone.Api/NancyBootstrapper.cs

@@ -33,6 +33,7 @@ namespace NzbDrone.Api
             container.Resolve<IMessageAggregator>().PublishEvent(new ApplicationStartedEvent());
 
             pipelines.AfterRequest.AddItemToStartOfPipeline(GzipCompressionPipeline.Handle);
+            pipelines.AfterRequest.AddItemToEndOfPipeline(CacheHeaderPipeline.Handle);
 
             ApplicationPipelines.OnError.AddItemToEndOfPipeline(container.Resolve<NzbDroneErrorPipeline>().HandleException);
         }

NzbDrone.Api/NzbDrone.Api.csproj

@@ -106,6 +106,7 @@
     <Compile Include="Directories\DirectoryModule.cs" />
     <Compile Include="Episodes\EpisodeModule.cs" />
     <Compile Include="Episodes\EpisodeResource.cs" />
+    <Compile Include="Extensions\CacheHeaderPipeline.cs" />
     <Compile Include="Extensions\GZipPipeline.cs" />
     <Compile Include="Extensions\NancyJsonSerializer.cs" />
     <Compile Include="Frontend\IAddCacheHeaders.cs" />

NzbDrone.Integration.Test/Client/ClientBase.cs

@@ -5,6 +5,7 @@ using NLog;
 using NzbDrone.Api.REST;
 using NzbDrone.Common.Serializer;
 using RestSharp;
+using System.Linq;
 
 namespace NzbDrone.Integration.Test.Client
 {
@@ -99,6 +100,8 @@ namespace NzbDrone.Integration.Test.Client
                 throw response.ErrorException;
             }
 
+            AssertDisableCache(response.Headers);
+
             response.ErrorMessage.Should().BeBlank();
 
             response.StatusCode.Should().Be(statusCode);
@@ -106,5 +109,13 @@ namespace NzbDrone.Integration.Test.Client
             return Json.Deserialize<T>(response.Content);
         }
 
+
+        private static void AssertDisableCache(IList<Parameter> headers)
+        {
+            headers.Single(c => c.Name == "Cache-Control").Value.Should().Be("no-cache, no-store, must-revalidate");
+            headers.Single(c => c.Name == "Pragma").Value.Should().Be("no-cache");
+            headers.Single(c => c.Name == "Expires").Value.Should().Be("0");
+        }
+
     }
 }