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docs: clarrify use of sw behind redirect (#32915)

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Closes #30684

PR Close #32915
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TinyMan 2019-09-28 18:07:05 +02:00 committed by Matias Niemelä
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commit ec482dadb1
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aio/content/guide/service-worker-devops.md
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@ -344,6 +344,24 @@ This script can be used both to deactivate `@angular/service-worker`
as well as any other Service Workers which might have been served in
the past on your site.
### Changing your app's location
It is important to note that service workers don't work behind redirect. You
may have already encountered the error `The script resource is behind a redirect, which is disallowed`.
This can be a problem if you have to change your app's location. If you setup
a redirect from the old location (for example `example.com`) to the new
location (for example `www.example.com`) the worker will stop working.
Also, the redirect won't even trigger for users who are loading the site
entirely from Service Worker. The old worker (registered at `example.com`)
tries to update and sends requests to the old location `example.com` which
get redirected to the new location `www.example.com` and create the error
`The script resource is behind a redirect, which is disallowed`.
To remedy this, you may need to kill the old worker using one of the above
techniques ([Fail-safe](#fail-safe) or [Safety Worker](#safety-worker)).
## More on Angular service workers
You may also be interested in the following: