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avg_dev

While it might be nice if the article spelled out the header, I do believe that there is more than implication present.

> 00:04:51 GET /w/atom.xml, unconditional.

> Fulfilled with 200, 502 KB.

> [...]

> A 20 minute retry rate with unconditional requests is wasteful. [...]

And If-Modified-Since makes a request conditional. https://developer.mozilla.org/en-US/docs/Web/HTTP/Conditiona...

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You left out a further explicit mention of conditional requests:

> Advised (via Retry-After header) to come back in one day since they are unwilling or unable to do conditional requests.

But I think it's still unarguable that the post doesn't explicitly mention If-Modified-Since, which it's not obliged to do, but the mention of it here could be helpful to someone. So why fuss?

There’s also the option of “If-None-Match”, to make the request conditional. The point is being conditional, not how.

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