Http Service Client no longer sends configured api version

[yanivnahoum]

Given an http service client and a group configuration in the application.yml that includes an API Version, the version is no longer sent by the client after upgrading to Spring Boot 4.0.4. The previous version works as expected.

spring:
  http:
    clients:
      connect-timeout: 3s
      read-timeout: 10s
      redirects: dont-follow
      imperative:
        factory: http-components
    serviceclient:
      todo:
        base-url: http://todo/api
        apiversion:
          default: 1.0
          insert:
            header: X-Version

A minimal example reproducing the issue can be found here (branch http-service-client-4.0.4) :
The test succeeds with Spring Boot 4.0.3, but fails with 4.0.4

[itsmevichu]

This issue is a regression in springframework-web caused by commit. The null check was removed, so it ends up setting the value to null in our case.

[wilkinsona]

Thanks, @itsmevichu. Closing in favor of spring-projects/spring-framework#36514.