I don't have an answer exactly cause I don't have the time to work it all out atm.
But, I think if you read the following links it may point you in the right direction.
The idea would be to exclude any .html files from the servlet.
Link 2 - read the follow up post.
Now, I think that the idea behind those links should work for what you are trying to do, but I'm not an expert in that area so I can't afford to spend the time working it out for you. Hopefully you'll make sense of it. If you do get it working would you mind posting your solution here? :P