SEO Tip #108: How Does Google Handle Not Found Pages That Don’t Return A 404?
Is returning a 200 instead of a 404 considered spam?
Matt Cutts: I wouldn’t necessarily consider it spam. A lot of the time it’s not done on deliberately because if it were then people would return a 404. We do have a name for this at Google. I’m not sure whether we’ve talked about it externally before but we call them crypto 404s; crypto from the Greek meaning hidden.
So a crypto
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