URL preserving option

[3bl3gamer]

Allows to preserve URL until response is received.
For example, on some http://site.com/blog is a link http://site.com/refresh which jush redirects back to http://site.com/blog.
If user clicks on refresh with pjax URL will change to http://site.com/refresh for a bit and then (on response) back to http://site.com/blog.
With this option URL will remain same during all refreshing.

[m1kc]

+1 to this PR. Gonna merge it?

[mislav]

I'm not super-excited about adding more configuration options, especially because it's for something for a use-case that I don't understand. What's wrong with a URL briefly changing? Native browser behavior would be the same way.

[m1kc]

First of all, browser's behavior is not the same: for example, when my Firefox meets a redirect, it displays only final URL in the address bar. That's a good thing: there's no point in showing intermediate URLs, because usually they're not for human eye anyway (like /logout?csrf_token=skdfuc8721812cc87x3). So, I want PJAX to copy browser's behavior. To be honest, I'd prefer this to be default behavior rather than an option, but an option is fine too.

[m1kc]

I don't understand this particular example from @3bl3gamer too, but redirect masking seems like a good idea to me. Of course it is better to get rid of redirect itself, but sometimes that's impossible.

[mislav]

I stand corrected: it seems that Chrome and Firefox don't show the URL until the final redirect. (Safari doesn't show URLs anymore.)

Closing as duplicate of #334. Although these issues don't seem to be related at first, we were discussing the shortcomings of when we update URLs/do pushState there and how we can improve the current situation. Ideally we'll figure things out and solve this without the need for extra configuration options.