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the Total impressions did show a significant drop in Search Analytics in Google Webmaster ToolsHave all your pages been reindexed as HTTPS? Are you looking at the HTTPS property or the HTTP property when you see the decline? How long has it been since you installed the 301?
I got some relief by removing the 301s redirecting every page to https@glitterball - not smart. All visitors following backlinks to HTTP pages will get security warnings, eventually being blocked by their browser from ever reaching your site.
looking at Search Analytics in Google Webmaster Tools show no immediate drop off in Google search clicks, so I do not believe that Google is initially sending less traffic
not smart. All visitors following backlinks to HTTP pages will get security warnings, eventually being blocked by their browser from ever reaching your site.
Where do they get a warning at the moment?The browser warns the user of nonsecure content. Depending on which browser is used, the warning is worded slightly different, but something like "Your connection is not secure. This site cannot be trusted..."
Any HTTP (nonsecure) page will cause the browser to give the warning. There's no reason to debate, the information is clear. The warnings will become more blatant going forward.
[edited by: glitterball at 9:59 am (utc) on Jul 4, 2017]