HTTP 400 with Spring Boot 4 API versioning enabled

[piomin]

Describe the bug

• In my application, I'm using springdoc-openapi-starter-webmvc-ui 3.0.0 and Spring Boot 4. I enabled the Spring new API versioning feature. After app startup, no errors in the log, but both /swagger-ui.html and /v3/api-docs/ return HTTP 400.

To Reproduce
Here's my sample app: https://github.com/piomin/sample-api-versioning.git. Just run it with the mvn spring-boot:run command.

I enabled api versioning with the following properties:

spring:
  mvc:
    apiversion:
      default: v1.0
      use:
        header: api-version
        path-segment: 1 

Expected behavior

• app returns API docs or at least prints an exception of what went wrong.

[ssferrazza]

@piomin Same here, as a workaround, I’m currently using the following snippet:

    @Bean
    public WebMvcConfigurer restVersioningConfigurer() {
        return new WebMvcConfigurer() {
            
             // other methods omitted

            @Override
            public void configurePathMatch(PathMatchConfigurer configurer) {
                configurer.addPathPrefix("/api/v{version}", HandlerTypePredicate.forBasePackage("org.springdoc").negate());
            }
        };
    }