On my website, I use languages in this way
domain.com/es/
domain.com/br/
domain.com/en/
etc ...
I want to know the form with "htaccess" to redirect the url forsozamente, if the user enters this way domain.com /
force him to go to: domain.com/en/
If the idea is simply to redirect the root domain, then that htaccess section should look like this:
RewriteEngine on
RewriteCond %{HTTP_HOST} ^dominio\.com$
RewriteRule ^$ es [L]
Why use a .htacces to address a single address? It would be enough to put a index.html (or the extension that corresponds) in the root ( dominio.com/index.html ) with a refresh that makes the redirect.
Doing it with .htacces is a waste, because that file would be parsed for each query to the site (and it is not cached).
to work with any domain, just put a rule that is "In the case that does not start with any language, redirects to / is /"
RewriteEngine on
RewriteRule ^(?!es|en|br)(.*) /es/$1/$2 [R=301,L]
# RewriteRule ^(es|en|br/)(.*) $1$2 [R=301,L]
The second rule is commented, it is just the opposite and leave it just in case.
It would be good to also pass in the options, the option QSA that indicates that if a query string comes, it is appended to the URL. But this already depends on your application
PS: tested with Htaccess Tester