Add support for addPathPrefix with Webflux swagger-ui

Describe the Feature When we use WebFluxConfigurer to set base-path, it’s unable to access http://server:port/context-path/swagger-ui.html. We can access to http://server:port/context-path/v3/api-doc though.

WebfluxConfigurer

@Configuration
@EnableWebFlux
class WebFluxConfiguration : WebFluxConfigurer {

    override fun configurePathMatching(configurer: PathMatchConfigurer) {
        configurer.addPathPrefix("/api/v1") { true }
    }
}

In this case, context-path should be replaced with /api/v1, so we should see swagger-ui at http://server:port/api/v1/swagger-ui.html.

It seems like that context-path is not loaded when generating the url of springdoc-config, because we can access to http://server:port/api/v1/v3/api-docs/swagger-config.

To Reproduce Steps to reproduce the behavior:

• What version of spring-boot you are using? Running with Spring Boot v2.4.0, Spring v5.3.1

• What modules and versions of springdoc-openapi are you using? Using springdoc-openapi-webflux-ui v1.5.2 with springdoc-openapi-kotlin v.1.5.2

• Provide with a sample code (HelloController) or Test that reproduces the problem I put a sample code to set context-path by WebFluxConfigurer above. so please refer that.

Expected behavior We should be able to access swagger-ui.html

[bnasslahsen]

@shota-hizawa-reazon,

The support is now added. You can test it using the latest snapshot.

[bnasslahsen]

@shota-hizawa-reazon,

This seems a different problem, as you are setting the path prefix using addPathPrefix. This one is not supported yet.