Proxy Cache Issue

I've taken over a project for a client who is behind a firewall, and they continue to see old versions of pages that I have updated on the hosting service.  When I navigate to the pages, I see the updated versions.

I think that the client must be connecting through a proxy that is holding old versions of the pages.

Will the techniques that cause browsers to NOT cache pages work for the proxies as well?  If there are methods that are specific to proxies, could someone let me know about them?

Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

Are these static .HTML pages?
if so, one way to force a reload is to append a random string to each URL, for example:

<A href="somePage.html"  onclick="this.href='somePage.html?'+Math.random();return true;">link</a>

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today

From novice to tech pro — start learning today.

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.