for Nginx and Apache
(a normal reverse tunnel: ssh -R 61001:localhost:22 user@myhost.tld)
Asuming your local application runs on port 3000 (http://localhost:3000/ in the browser shows your nice webpage) we login with a user noroot and the ssh port 22 on the host myhost.tld to forward that to the server port 61001. Being logged in on the the server noroot@myhost.tld:22 the command curl -v http://localhost:61001/ should be equal to on the local machine http://localhost:300
just run: ssh -i ~/.ssh/server.key -l noroot -p 22 myhost.tld -R 61001:localhost:3000