Fixed: Legitimate API redirects

src/NzbDrone.Api/Authentication/EnableAuthInNancy.cs

@@ -75,7 +75,7 @@ namespace NzbDrone.Api.Authentication
             if (context.Request.IsApiRequest())
             {
                 if ((context.Response.StatusCode == HttpStatusCode.SeeOther &&
-                     context.Response.ContentType.Equals("text/html", StringComparison.InvariantCultureIgnoreCase)) ||
+                     context.Response.Headers["Location"].StartsWith("/login", StringComparison.InvariantCultureIgnoreCase)) ||
                     context.Response.StatusCode == HttpStatusCode.Unauthorized)
                 {
                     context.Response = new { Error = "Unauthorized" }.AsResponse(HttpStatusCode.Unauthorized);