Fixed: Third-party clients calling api without Accept header

src/Lidarr.Http/LidarrBootstrapper.cs

@@ -5,10 +5,11 @@ using NLog;
 using NzbDrone.Common.EnvironmentInfo;
 using NzbDrone.Common.Instrumentation;
 using NzbDrone.Core.Instrumentation;
-using NzbDrone.Core.Lifecycle;
-using NzbDrone.Core.Messaging.Events;
 using Lidarr.Http.Extensions.Pipelines;
 using TinyIoC;
+using Nancy;
+using System;
+using Nancy.Responses.Negotiation;
 
 namespace Lidarr.Http
 {
@@ -51,6 +52,18 @@ namespace Lidarr.Http
             return _tinyIoCContainer;
         }
 
+        protected override Func<ITypeCatalog, NancyInternalConfiguration> InternalConfiguration
+        {
+            get
+            {
+                // We don't support Xml Serialization atm
+                return NancyInternalConfiguration.WithOverrides(x => {
+                    x.ResponseProcessors.Remove(typeof(ViewProcessor));
+                    x.ResponseProcessors.Remove(typeof(XmlProcessor));
+                });
+            }
+        }
+
         public override void Configure(Nancy.Configuration.INancyEnvironment environment)
         {
             environment.Diagnostics(password: @"password");

src/NzbDrone.Integration.Test/GenericApiFixture.cs

@@ -0,0 +1,51 @@
+using System.Net;
+using FluentAssertions;
+using NUnit.Framework;
+using NzbDrone.Common.Extensions;
+using NzbDrone.Integration.Test.Client;
+using RestSharp;
+
+namespace NzbDrone.Integration.Test
+{
+    [TestFixture]
+    public class GenericApiFixture : IntegrationTest
+    {
+        [TestCase("application/json")]
+        [TestCase("text/html, application/json")]
+        [TestCase("application/xml, application/json")]
+        [TestCase("text/html, */*")]
+        [TestCase("*/*")]
+        [TestCase("")]
+        public void should_get_json_with_accept_header(string header)
+        {
+
+            var request = new RestRequest("system/status")
+            {
+                RequestFormat = DataFormat.None
+            };
+            request.AddHeader("Accept", header);
+
+            var response = RestClient.Execute(request);
+
+            response.StatusCode.Should().Be(HttpStatusCode.OK);
+            response.ContentType.Should().Be("application/json; charset=utf-8");
+        }
+
+        [TestCase("application/xml")]
+        [TestCase("text/html")]
+        [TestCase("application/junk")]
+        public void should_get_unacceptable_with_accept_header(string header)
+        {
+
+            var request = new RestRequest("system/status")
+            {
+                RequestFormat = DataFormat.None
+            };
+            request.AddHeader("Accept", header);
+
+            var response = RestClient.Execute(request);
+
+            response.StatusCode.Should().Be(HttpStatusCode.NotAcceptable);
+        }
+    }
+}