Redirect subdomain in Multisite installation?

RewriteRule ^(.*)$ https://example.com/summer/$1 [R=301]

You need to include the L flag on the RewriteRule directive, ie. [R=301,L] and ensure this rule is near the top of the .htaccess file, before the existing WordPress directives.

Without the L flag, processing continues and the request is further rewritten (by the WordPress front-controller) before the eventual (incorrect) redirect.

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