问题
Our requirement is to have our users login to an app via a URL and, having added the app to their homescreen as a PWA, maintain that logged-in status, so that a second login to the installed PWA is not required. This is certainly possible under Android/Chrome where the logged-in status can be initially stored and accessed by the PWA via a variety of mechanisms (including cookie, IndexedDB, cache).
However, it now appears to us that a PWA under iOS 14/iPadOS 14 is tightly sandboxed and Safari has no way of passing logged-in status to it. Over the years, and through the various versions of iOS, a variety of sharing mechanisms have been offered - and rendered obsolete in a subsequent version. These include:
- the cache, accessed via a fake endpoint (ref)
- a session cookie (ref)
A mechanism that doesn't rely on browser-shared storage is the addition of a server-generated token to the URL (ref), (ref) - the problem here is that it upsets Android/Chrome, which uses an unmodified start_url in the web app manifest.
This is an issue which has provoked a number of SO questions over the years (three of them referenced above) and some of them have been answered with solutions that apparently worked under earlier versions of iOS. What we're wanting now is a solution which works under the latest version as well as it works under Android/Chrome. Any offers?
来源：https://stackoverflow.com/questions/62669966/how-to-maintain-login-status-in-a-pwa-initially-loaded-via-safari-14-ios-14