Intercepting post/redirect/get form submissions

[domenic]

A goal of app history is that you should be able to use the navigate handler to centrally convert MPA navs into SPA navs.

It'd be good to work out a detailed example of this for form submissions. In particular, given a typical post/redirect/get MPA flow where the <form> does a POST to /submission and the server then does a 303 redirect to /confirmation-page, what does that look like in a navigate handler?

If you just do event.respondWith(...), the URL will stay on /submission. So this speaks to some previous discussions about allowing a redirect-type flow within a navigate handler, so that you could do a client-side "redirect" to /confirmation-page. Then a second navigate event would fire for /confirmation-page, which would result in appropriate DOM updates showing the confirmation.