Re: [w3c/ServiceWorker] _Update algorithm should unregister SW on 404 and 410 errors (#204)

> If the server responds with a 404 that is quite an obvious error of not finding a file and I have never encountered a server responding with 404 when it was actually a 500 error something..

I'm pretty sure there are such webservers, e.g. an entry is temporarily missing from database or just a glitch happened. But yes, that's probably not very common for static files such as SW file.

> If the server responds with a 404 that is quite an obvious error of not finding a file and I have never encountered a server responding with 404 when it was actually a 500 error something..

This sounds reasonable to me.

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