Header "if-none-match" causes server side re-rendering

[iKoala]

I found that when the browser provides request header "if-none-match" with etag value same as the generated content, cacheable-response doesn't save the response in cache after expired.
This causes the server executes SSR on every request because cacheable-response doesn't save the response cache.

Should the cache saving block

cacheable-response/index.js

Lines 123 to 127 in 55eca7a

	if (!isHit) {
	const payload = { etag, createdAt, ttl, data, ...props }
	const value = await compress(payload)
	await cache.set(key, value, ttl)
	}

being place before the 304 response block

cacheable-response/index.js

Lines 117 to 121 in 55eca7a

	if (!isModified) {
	res.statusCode = 304
	res.end()
	return
	}

?

[iKoala]

I think it is related to this pull request #32