update image encoding

MediaBrowser.Api/Images/ImageService.cs

@@ -698,10 +698,21 @@ namespace MediaBrowser.Api.Images
 
             var userAgent = Request.UserAgent ?? string.Empty;
 
-            if (userAgent.IndexOf("dalvik", StringComparison.OrdinalIgnoreCase) != -1 &&
-                userAgent.IndexOf("android", StringComparison.OrdinalIgnoreCase) != -1)
+            if (!supportsWebP)
             {
-                supportsWebP = true;
+                if (string.Equals(Request.QueryString["accept"], "webp", StringComparison.OrdinalIgnoreCase))
+                {
+                    supportsWebP = true;
+                }
+            }
+
+            if (!supportsWebP)
+            {
+                if (userAgent.IndexOf("crosswalk", StringComparison.OrdinalIgnoreCase) != -1 &&
+                    userAgent.IndexOf("android", StringComparison.OrdinalIgnoreCase) != -1)
+                {
+                    supportsWebP = true;
+                }
             }
 
             if (supportsWebP)

MediaBrowser.Server.Mono/Program.cs

@@ -77,7 +77,7 @@ namespace MediaBrowser.Server.Mono
             // Allow all https requests
             ServicePointManager.ServerCertificateValidationCallback = new RemoteCertificateValidationCallback(delegate { return true; });
 
-            var fileSystem = new ManagedFileSystem(new PatternsLogger(logManager.GetLogger("FileSystem")), false, true);
+            var fileSystem = new ManagedFileSystem(new PatternsLogger(logManager.GetLogger("FileSystem")), false, false);
             fileSystem.AddShortcutHandler(new MbLinkShortcutHandler(fileSystem));
 
             var nativeApp = new NativeApp(options);