How do I add an Onion-Location header with Caddy2?

Question

How do I add an Onion-Location header to all my pages in Caddy2 the value of which is $string+request_path

Onion-Location is an easy way to advertise an onion site to the users. You can either configure a web server to show an Onion-Location Header or add an HTML meta attribute in the website.

— Tor Project

The example Nginx configuration shows:

add_header Onion-Location http://<your-onion-address>.onion$request_uri;

I think they meant path, rather than full URI.

Answer 1

Like this:

header Onion-Location http://whatevercrypticname.onion{path}

If you have the $TOR_HOSTNAME saved as an environment variable then use

header Onion-Location http://{$TOR_HOSTNAME}{path}