I've setup a static website on GAE using hints found elsewhere, but can't figure out how to return a 404 error. My app.yaml file looks like - url: (.*)/ static_files: static\1/index.html upload: static/index.html - url: / static_dir: static with all the static html/jpg files stored under the static directory. The above works for files that exist, but returns a null length file if they don't. The a