Routing Issue: Blank Page When Routing Ruby on Rails Admin Section to "/admin" Route

1. The problem I’m having:

I basically have to serve static files (front end in React) of the app at and the admin section (ROR) at So, as I’m trying to route the admin section of my Ruby on Rails application to the /admin route,

I tried routing the admin section to just my and it’s working flawlessly. However, as soon as I route it to /admin, I’m getting a blank page and it’s not getting routed.

2. Caddy version:


3. How I installed and ran Caddy:

a. System environment:

Ubuntu 20.04.6 LTS

b. Caddyfile config: {
    root * /var/www/site
    @admin {
        path /admin/*
    reverse_proxy @admin localhost:4322

That’s because there’s nothing in your Caddyfile that handles requests to /admin, only /admin/. The slash is significant, and sometimes not having it will break front end pages.

Also you can just write it inline: reverse_proxy /admin/* …


To add onto that; you could either change it to /admin*, or add redir /admin /admin/ to make sure the leading slash always exists (which is ideal, to have a canonical URL).


Yeah, I tried that, but it didn’t work either.
Could it be a Ruby back-end issue? Because it works perfectly when the configuration is like this: {
    reverse_proxy  localhost:4322

but as soon as I route it to /admin, it just shows me a blank white page.

Sure, Thanks!

If your upstream app doesn’t know about /admin then it makes sense that it wouldn’t work.

You’d probably be better off making a subdomain like and serve it from there, if you need to continue serving a static site at your apex domain.

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