When I visit a particular site on my laptop through my tethered phone's 3G, I keep getting served a certain broken javascript file. However when I do a force refresh on the page (Ctrl+F5) the most recent copy of the file is served up correctly, so clearly the old javascript file is being cached somewhere (probably on my phone providers proxy).
How can I find out where this cached file is being served from, and somehow break the cache to force the most recently copy to to be served?
Edit: What I'm talking about is some kind of tracert on the particular JS file?