Based on @Zuul's response, follow the version for your specific case,
RewriteEngine On
RewriteCond %{HTTPS} on
RewriteRule blog/tag/dengue-mata/ http://meudominio.com/blog/tag/dengue-mata/ [R=301,L]
If you want to use parameters or some extra data after the bar, you can do this:
RewriteEngine On
RewriteCond %{HTTPS} on
RewriteRule blog/tag/dengue-mata(.*) http://meudominio.com/blog/tag/dengue-mata$1 [R=301,L]
Note that I have omitted the final slash, to contemplate URLs without the slash as well. Adjust as required.
Important: If your domain does not have the correct certificate, when you access it by https://
, the error message will appear before the redirect anyway. This is the nature of the protocol, which first makes the connection secure, and then requests the path.
Beware of pure redirect:
The redirect is great, but when you just change the protocol, and the path is the same, you can loop in infinite, as in this case:
Redirect 301 /blog/tag/dengue-mata/ http://meudominio.com/blog/tag/dengue-mata/