“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

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 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");