Fixed: Updated error message if services respond with html

Co-Authored-By: taloth <taloth@users.noreply.github.com>

src/NzbDrone.Common/Http/HttpClient.cs

@@ -267,6 +267,7 @@ namespace NzbDrone.Common.Http
         public HttpResponse<T> Get<T>(HttpRequest request) where T : new()
         {
             var response = Get(request);
+            CheckResponseContentType(response);
             return new HttpResponse<T>(response);
         }
 
@@ -285,7 +286,16 @@ namespace NzbDrone.Common.Http
         public HttpResponse<T> Post<T>(HttpRequest request) where T : new()
         {
             var response = Post(request);
+            CheckResponseContentType(response);
             return new HttpResponse<T>(response);
         }
+
+        private void CheckResponseContentType(HttpResponse response)
+        {
+            if (response.Headers.ContentType != null && response.Headers.ContentType.Contains("text/html"))
+            {
+                throw new UnexpectedHtmlContentException(response);
+            }
+        }
     }
 }

src/NzbDrone.Common/Http/HttpException.cs

@@ -7,13 +7,19 @@ namespace NzbDrone.Common.Http
         public HttpRequest Request { get; private set; }
         public HttpResponse Response { get; private set; }
 
-        public HttpException(HttpRequest request, HttpResponse response)
+        public HttpException(HttpRequest request, HttpResponse response, string message)
-            : base(string.Format("HTTP request failed: [{0}:{1}] [{2}] at [{3}]", (int)response.StatusCode, response.StatusCode, request.Method, request.Url))
+            : base(message)
         {
             Request = request;
             Response = response;
         }
 
+        public HttpException(HttpRequest request, HttpResponse response)
+            : this(request, response, string.Format("HTTP request failed: [{0}:{1}] [{2}] at [{3}]", (int)response.StatusCode, response.StatusCode, request.Method, request.Url))
+        {
+
+        }
+
         public HttpException(HttpResponse response)
             : this(response.Request, response)
         {

src/NzbDrone.Common/Http/UnexpectedHtmlContentException.cs

@@ -0,0 +1,13 @@
+using System;
+
+namespace NzbDrone.Common.Http
+{
+    public class UnexpectedHtmlContentException : HttpException
+    {
+        public UnexpectedHtmlContentException(HttpResponse response)
+            : base(response.Request, response, $"Site responded with browser content instead of api data. This disruption may be temporary, please try again later. [{response.Request.Url}]")
+        {
+
+        }
+    }
+}

src/NzbDrone.Common/NzbDrone.Common.csproj

@@ -182,6 +182,7 @@
     <Compile Include="Http\TlsFailureException.cs" />
     <Compile Include="Http\TooManyRequestsException.cs" />
     <Compile Include="Extensions\IEnumerableExtensions.cs" />
+    <Compile Include="Http\UnexpectedHtmlContentException.cs" />
     <Compile Include="Http\UserAgentBuilder.cs" />
     <Compile Include="Instrumentation\CleanseLogMessage.cs" />
     <Compile Include="Instrumentation\CleansingJsonVisitor.cs" />