There's a non-zero amount of No Content Returned message in RESTBase logs. Seem to be mostly for update requests, but without a clear pattern regarding individual requests - page size/complexity or content type doesn't seem to matter.
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I my experience, this is typically Parsoid not returning anything. This could potentially be how a recently-deceased Parsoid worker looks to us.
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Looking through the pages triggering these errors, they mostly seem to be huge and complex. An example showing up multiple times is https://commons.wikimedia.org/api/rest_v1/page/html/Emoji.
I am inclined to attribute this to Parsoid workers being killed after failing the watchdog checks. @Arlolra @ssastry @Pchelolo, any objections to doing so?
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+1. Just encountered this error in the logs for https://www.wikidata.org/wiki/User:Pasleim/Items_for_deletion/Page_deleted so I'm inclined to draw the same conclusion.