Cannot see swagger-ui.html on the server open-api

Question

I'm using Spring-Boot 2.x.x, gradle 6, Java 8

and I would like to use Openapi UI for documentation instead of Swagger 2

I didn't have those issues with Swagger 2

dependencies {
    implementation('org.springdoc:springdoc-openapi-ui:1.5.3')
} 

and swagger-ui.html is available on

http://localhost:8080/swagger-ui.html

but on Kubernetes with docker container the service is available like

http://serverX/api-name/...

And open-api documentation does'nt work on

http://serverX/api-name/swagger-ui.html (503)

If I add to redirect url some additional things

http://serverX/api-name/swagger-ui/index.html?configUrl=http:http://serverX/api-name/api-docs/swagger-config/

the page of Open api will be available without content

finally, if I add in Explore part this

/api-name/api-docs

not only

/api-docs

it works

How to solve it?

I would like to add some parameters to get swagger-ui on

http://serverX/api-name/swagger-ui.html