How to run discourse on subdirectory of external domain?

Product Support Self-hosting
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So I have been able to fix this with nginx. I gave up on workers as I don’t know much about them…

The idea is that my root domain will point to a server I control, and I’ll let nginx merge the two platforms together.

server
{
    listen 80;
    server_name test.ultraluz.com.br;

    location /blog {
        proxy_set_header Host forum.ultraluz.com.br;
        proxy_pass https://forum.ultraluz.com.br/;
        proxy_redirect https://forum.ultraluz.com.br/ http://test.ultraluz.com.br/blog;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    }

       location /stylesheets {
        proxy_set_header Host forum.ultraluz.com.br;
        proxy_pass https://forum.ultraluz.com.br/stylesheets;
        proxy_redirect https://forum.ultraluz.com.br/ http://test.ultraluz.com.br/blog;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    }

    
       location /assets {
        proxy_set_header Host forum.ultraluz.com.br;
        proxy_pass https://forum.ultraluz.com.br/assets;
        proxy_redirect https://forum.ultraluz.com.br/ http://test.ultraluz.com.br/blog;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    }

        location /svg-sprite {
        proxy_set_header Host forum.ultraluz.com.br;
        proxy_pass https://forum.ultraluz.com.br/svg-sprite;
        proxy_redirect https://forum.ultraluz.com.br/ http://test.ultraluz.com.br/blog;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    }

        location /404-body {
        proxy_set_header Host forum.ultraluz.com.br;
        proxy_pass https://forum.ultraluz.com.br/404-body;
        proxy_redirect https://forum.ultraluz.com.br/ http://test.ultraluz.com.br/blog;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    }

        location /message-bus {
        proxy_set_header Host forum.ultraluz.com.br;
        proxy_pass https://forum.ultraluz.com.br/message-bus;
        proxy_redirect https://forum.ultraluz.com.br/ http://test.ultraluz.com.br/blog;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    }

               location /latest.json {
        proxy_set_header Host forum.ultraluz.com.br;
        proxy_pass https://forum.ultraluz.com.br/latest.json;
        proxy_redirect https://forum.ultraluz.com.br/ http://test.ultraluz.com.br/blog;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    }

                       location /javascripts {
        proxy_set_header Host forum.ultraluz.com.br;
        proxy_pass https://forum.ultraluz.com.br/javascripts;
        proxy_redirect https://forum.ultraluz.com.br/ http://test.ultraluz.com.br/blog;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    }

                            location /logs {
        proxy_set_header Host forum.ultraluz.com.br;
        proxy_pass https://forum.ultraluz.com.br/logs;
        proxy_redirect https://forum.ultraluz.com.br/ http://test.ultraluz.com.br/blog;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    }

                                  location /u {
        proxy_set_header Host forum.ultraluz.com.br;
        proxy_pass https://forum.ultraluz.com.br/u;
        proxy_redirect https://forum.ultraluz.com.br/ http://test.ultraluz.com.br/blog;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    }
}

This works, but I only have one issue. When people go to /blog they see the discourse 404 page doesn’t exist instead of the homepage? I’m not sure what could be causing this?

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