Fixed MediaCover endpoint.

src/NzbDrone.Api/Frontend/Mappers/IndexHtmlMapper.cs

@@ -52,6 +52,7 @@ namespace NzbDrone.Api.Frontend.Mappers
             resourceUrl = resourceUrl.ToLowerInvariant();
 
             return !resourceUrl.StartsWith("/content") &&
+                   !resourceUrl.StartsWith("/mediacover") &&
                    !resourceUrl.Contains(".") &&
                    !resourceUrl.StartsWith("/login");
         }

src/NzbDrone.Api/Frontend/Mappers/MediaCoverMapper.cs

@@ -1,3 +1,4 @@
+using System;
 using System.IO;
 using System.Text.RegularExpressions;
 using NLog;
@@ -42,7 +43,7 @@ namespace NzbDrone.Api.Frontend.Mappers
 
         public override bool CanHandle(string resourceUrl)
         {
-            return resourceUrl.StartsWith("/MediaCover");
+            return resourceUrl.StartsWith("/MediaCover", StringComparison.InvariantCultureIgnoreCase);
         }
     }
 }