Problems with aol proxy servers?

[always_here]

I'm just starting to try some server side operations and I've been unable to find any answers to 2 questions:

1) if I use SSI (with .htm extension) to include dynamic data (such as time & day), will I run into problems with things like aol proxy servers serving an older cached page?

2) same question for php scripts

Appreciate any help - thanks!

[sugarkane]

With php, you could send an instruction in the headers that tells proxies not to cache the page:

<? header("Pragma: no-cache\n"); ?>

That line must be the first line of the page.

Not sure about SSI -- anyone?