Deploy springdoc in subdirectory returns 404

[soasada]

I'm serving a Spring Boot application behind a nginx as reverse proxy, it is served in a subdirectory (let's say "/subdir"). The API is working correctly, but when I visit "https://example.com/subdir/swagger-ui/index.html" it returns the index.html correctly with a 200 HTTP OK, but is not able to find all of the static files that the index.html is pointing to: https://example.com/subdir/swagger-ui/swagger-ui.css for instance. In the other hand, if I try to visit "https://example.com/subdir/v3/api-docs/swagger-config" it also works.

• What version of spring-boot you are using? 2.6.2
• What modules and versions of springdoc-openapi are you using? 1.6.3

I'm using:

server.forward-headers-strategy=framework
server.tomcat.redirect-context-root=false

in my application.properties.

And this is my nginx config:

location /subdir/ {
                proxy_pass http://127.0.0.1:8080/;
                proxy_redirect off;
                proxy_buffer_size 128k;
                proxy_buffers 4 256k;
                proxy_busy_buffers_size 256k;

                proxy_set_header Host $http_host;
                proxy_set_header X-Real-IP $remote_addr;
                proxy_set_header X-Forwarded-Proto https;
                proxy_set_header X-Forwarded-Prefix $http_x_forwarded_prefix;
                proxy_set_header X-Forwarded-Host $http_x_forwarded_host;
                proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
                proxy_set_header X-NginX-Proxy true;

                proxy_set_header X-Forwarded-Protocol https;
                proxy_set_header X-Forwarded-Ssl on;
                proxy_set_header X-Url-Scheme https;
}

What am I missing?

[bnasslahsen]

@soasada,

1. Change this line: proxy_set_header X-Forwarded-Prefix $http_x_forwarded_prefix;
   to proxy_set_header X-Forwarded-Prefix /subdir;

2. And in your backend spring-boot apps, do not forget:

server.forward-headers-strategy=framework
server.use-forward-headers=true

[soasada]

Thanks for your help @bnasslahsen I have fixed the issue with:

My nginx config:

location ^~ /subdir/ {
                proxy_pass http://127.0.0.1:8080/;
                proxy_redirect off;

                proxy_set_header Host $http_host;
                proxy_set_header X-Real-IP $remote_addr;
                proxy_set_header X-Forwarded-Proto https;
                proxy_set_header X-Forwarded-Prefix /subdir;
                proxy_set_header X-Forwarded-Host $http_x_forwarded_host;
                proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
                proxy_set_header X-NginX-Proxy true;

                proxy_set_header X-Forwarded-Protocol https;
                proxy_set_header X-Forwarded-Ssl on;
                proxy_set_header X-Url-Scheme https;
        }

And in my application.properties:

server.forward-headers-strategy=framework