why does requests does not get cached when using ajax with post method?

[yaragallamurali]

Normally when we use post method with forms, the requests are geting cached. I mean when we use the back button to visit the previous page the request is not being sent to the server to display the previous form. It just loads the form from the cache and loads the field values from the cache. But it is not the case with ajax. when we use ajax with post method the requests are not cached. when we use the back button also the ajax gets the content from the server which is contrary to its "get" method. So why this difference?

[davej]

I'm guessing the cache can't make sense of partial pages.

[yaragallamurali]

I'm guessing the cache can't make sense of partial pages.

if that is the case why is it happening in case of forms. I mean when post is used directly with <form> element in html? what is the difference between ajax post and form post?

Edited October 19, 2013 by yaragallamurali