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Service Worker issues

From: Sam Ruby <rubys@intertwingly.net>
Date: Wed, 27 Jul 2016 11:57:29 -0400
To: public-webapps@w3.org
Message-ID: <5020756d-be0b-2bce-926e-411f57b7e6d0@intertwingly.net>
The following is a mix of spec and implementation issues that I 
encountered in my as-of-yet unsuccessful attempt to make use of service 
workers in the ASF Board Agenda tool.

1) the "offline fallback" use case for Service Workers involves 
intercepting fetch requests, issuing the request, and then recovering 
from any errors that may occur.  Unfortunately, issuing the 
event.request will not faithfully reproduce the original navigate 
request, in particular, credentials are not included.

2) passing credentials: 'include' on fetch requests within a service 
worker will succeed if the browser has access to the credentials (e.g. 
due to prompting the user earlier in the browser session).  If the 
credentials are not present, Firefox will prompt for this information. 
Chrome will not.  This is a showstopper for offline access to an 
authenticated web page with Chrome.

3) event.request.headers.get("Authorization") is available on Firefox 
but not on Chrome.

4) cache.keys() is supposed to return a promise.  On both Firefox and 
Chrome, cache.keys() returns an empty array instead.  cache.matchAll() 
can be used to get all of the responses, but not the keys.

5) calling registration.unregister() followed by 
navigator.serviceWorker.getRegistrations() will still return a list 
containing the now unregistered service worker in both Firefox and Chrome.

6) EventSource is available to service workers in Chrome but not in 
Firefox.  Using importScripts in an attempt to load the Yaffle polyfill 
doesn't work.

Advice on how to proceed with these issues (filing bugs on the spec 
and/or one or more implementations, perhaps?) would be greatly appreciated.


- Sam Ruby
Received on Wednesday, 27 July 2016 15:57:55 UTC

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