ClientBundle and clear.cache.gif

I am using a ClientBundle of images in my project and I am getting a
ton of requests to the server for clear.cache.gif. The ClientBundle
documentation does not reference clear.cache.gif and I tried the
suggestion in the old ImageBundle documentation of adding an Expires
header with a future time stamp to all outgoing images from Tomcat,
but I am still getting a ridiculous amount of requests for that image
to the server. Anyone know a resolution to this problem or is just
something you're stuck with if you use ClientBundle? Thanks for any
help.