When setting up https on an existing server, you need to provide a redirect for all those visitors arriving via http backlinks. Here is how to do this.

Cybersecurity in the Age of the Machine
When setting up https on an existing server, you need to provide a redirect for all those visitors arriving via http backlinks. Here is how to do this.
To redirect a subdirectory in NGINX, use this location block (an example for https):
location /old-subdirectory { return 301 https://$server_name/new-subdirectory/; }
For more NGINX redirects see this post: RegEx Bliss: Set Up URL Redirects in NGINX Using Regular Expressions without Rewrites.
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