Search Console traffic to a page that returns an error
What this means
Search Console reports impressions for this URL, but the crawl received a status of 400 or above. A listing survives in the index for some time after the page behind it breaks, so real searchers are still choosing the result and landing on an error. The guidance differs by status: a 5xx on a page with proven demand is an outage, while a 4xx is a removal to reverse or redirect.
How to fix it
For a 5xx, restore the server response first, then request indexing so the listing is revalidated before Google drops it. For a 4xx, put the page back if it was removed by mistake, or 301-redirect the URL to the closest surviving equivalent. Leave it as a 404 only where there is genuinely no replacement.
Fix effort
This check needs a developer fix: it turns on a routing, hosting or infrastructure decision that no automatic edit can make safely.
Authoritative source
https://developers.google.com/search/docs/crawling-indexing/http-network-errors
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