Run in a subfolder of root

[salvadorAnt]

How to run in a subfolder of root?
i would need for the static content and websocket because in same reverse proxy there are other websocket
the address would be: https://localhost/ssh/

i configured in config.yaml:
prod:

http path for static files and views

static_prefix: /ssh
api_prefix: "ssh"

RewriteEngine on
RewriteCond %{HTTP:Upgrade} =websocket [NC]
RewriteRule /ssh/(.*)           ws://sshweb:2222/ssh/$1 [P,L]
RewriteCond %{HTTP:Upgrade} !=websocket [NC]
RewriteRule /ssh/(.*)           http://sshweb:2222/ssh/$1 [P,L]

But I can't get it working