I'm using newest springdoc library to create one common endpoint with all Swagger configurations in one place. There're a bunch of microservices deployed in Kubernetes, so having documentation in one place would be convenient. The easiest way to do that is by using sth like this (https://springdoc.org/faq.html#how-can-i-define-groups-using-applicationyml):

springdoc:
  api-docs:
    enabled: true
  swagger-ui:
    disable-swagger-default-url: true
    urls:
      - name: one-service
        url: 'http://one.server/v3/api-docs'
      - name: second-service
        url: 'http://second.server/v3/api-docs'

and it works great, I can choose from list in upper right corner. The problem is that it doesn't work through proxy. According to documentation I need to set some headers (https://springdoc.org/faq.html#how-can-i-deploy-springdoc-openapi-ui-behind-a-reverse-proxy) and it works for single service called directly. But when i try grouping described above, headers are not passed to one-service or second-service, and they generates documentation pointing to localhost.

I suspect I need to use grouping (https://springdoc.org/faq.html#how-can-i-define-multiple-openapi-definitions-in-one-spring-boot-project) but I miss good example, how to achive similar effect (grouping documentation from different microservices). Examples shows only one external address, or grouping local endpoints. I hope, that using this approach, I'll be able to pass headers.