How can I add expire headers for scripts that are not on my server?

Question

I have a website and I added the expire headers on all pages/images and scripts but I don’t know how I could add expire headers to external scripts.

For example Goo

Answer 1

You may be able to add a query string parameter to fool the browser into thinking it's requesting a different resource. For example, if you want the browser to never cache a CSS, you can add a question mark followed by a random number to the end of the URL. This usually works but can be made to not work by the server hosting the file. Try it and see.