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, nofollow"> into my pages, and I've been searching a while but didn't get some valuable clues.
There are about 100 URLs are soft 404, to redirect them all one by one is a bit silly as it would cost too much time for me.
If i just add those links into robot.txt like below
User-agent: * Disallow: /mysite.asp Disallow: /mysite-more.html
if this way will fix all soft404s solidly? or if there is a way to change all soft404 to hard404? Please give me some suggestions. Many thanks