: Robot.txt can get all soft404s fixed? I got many soft404 in Google webmaster Tools, and those webpages aren't existing any more. thus I am unable to insert <meta name="robots" content="noindex,

@Nimeshi995

Wow. I think I got what you are saying, but there are some missing pieces so please bare with me.

Soft 404 errors are often something really stupid like having the phrase not found in your content. That drives me nuts! It happens to me all the time. It cannot occur unless Google sees a page and (likely) is getting a page with not found but no actual 404 response header. Something is interrupting the normal 404 error process. This we know because you tell us that the pages do not exist.

I am not sure how a non-existing page can have soft 404 unless it is being redirected or triggering a custom 404 error that is not working properly. If this is the case, then remove the redirect or custom 404 and let a real 404 happen. It may take take about 30 days or so for Google to stop looking for these pages. But it will clear up in time.

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