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Re:NPM proxy users receiving ERR 418 I'm a teapot by TheDong on Monday May 28, 2018 @11:22PM (#17176236)
In general, proxies and other third party clients will consider 4xx errors (edit: un)retriable.

That's one simple obvious difference.

Re:NPM proxy users receiving ERR 418 I'm a teapot by reificator on Tuesday May 29, 2018 @12:19AM (#17176471)
Do you mean 5XX? 4XX errors generally cannot be retried with a different result.