“Re open last closed tab” causing to show last ajax request content

Question

I am using HTML 5 history api to save state when ajax requests happen and i provide full html content if user request to same page with none ajax request.

\"Re-open

Answer 1

Problem was causing by http response headers. Headers was contain cacheable information for ajax requests so browser was showing that url content from cache without hit to database.

After removing cache params from response headers then browser was able to hit server without brings content from cache.

Answer 2

When you reopen a closed tab, the browser is allowed to reuse the data from cache for the given URL to populate the window. Since the data in cache is from the ajax request response, that's what it uses, and you see the JSON.

So that leads to the question: Why didn't the browser use the HTML from cache when satisfying the ajax request? Browsers use different rules to determine whether to use cached content depending on what they're doing. In this case, it appears Chrome is happy to reuse it when restoring the recently-closed tab, and not when doing the ajax request.

You can correct it by telling the browser to never cache the response. Whether that's desirable depends on your use case.

For instance, inserting these at the top of your file (after the opening <?php tag, of course) makes it not happen for me:

header("Cache-Control: no-store, no-cache, must-revalidate, max-age=0");
header("Cache-Control: post-check=0, pre-check=0", false);
header("Pragma: no-cache");

Answer 3

It all depends which browser you are using, and which optimisations are enabled.

Google Chrome for instance will keep the page in memory, so when you hit back and it goes to a new site, or when you do re-open closed tab - it will restore the page from memory.

Older/slower browsers will just refresh anything.

Though this shouldn't really be a problem, as your javascript state should be restored as well - it should be exactly the same in every way when they re-open that page.