X-Forwarded Headers not used

[sonic-air-swimmer]

Describe the bug
Getting "Failed to load remote configuration." when accessing swagger-ui behind api gateway.

Have gone through #215, #153 and https://springdoc.org/faq.html#how-can-i-deploy-springdoc-openapi-ui-behind-a-reverse-proxy
Have set server.forward-headers-strategy = framework.

The api gateway is host on port 8080, serving ServiceA at port 8081 when accessed via /api/servicea/.

A call to test service in ServiceA through api gateway shows that http headers are all set:
C:>curl http://localhost:8080/api/servicea/test
Request HTTP Headers:{user-agent=curl/7.79.1, accept=/, forwarded=proto=http;host="localhost:8080";for="127.0.0.1:50729", x-forwarded-for=127.0.0.1, x-forwarded-proto=http, x-forwarded-prefix=/api/servicea, x-forwarded-port=8080, x-forwarded-host=localhost:8080, host=localhost:8081, content-length=0}

While a call made directly to test service it is not having X-Forwarded headers:
C:>curl http://localhost:8081/test
Request HTTP Headers:{host=localhost:8081, user-agent=curl/7.79.1, accept=/}

To Reproduce
Steps to reproduce the behavior:

• What version of spring-boot you are using?
  2.6.6

• What modules and versions of springdoc-openapi are you using?
  springdoc-openapi-ui, version 1.6.7

• Provide with a sample code (HelloController) or Test that reproduces the problem
  minimal reproducible code: https://github.com/sonic-air-swimmer/SpringCloudGatewaySwagger

Expected behavior

• A clear and concise description of what you expected to happen.
  Able to access swagger-ui when going through api gateway.

Screenshots
If applicable, add screenshots to help explain your problem.

[bnasslahsen]

@sonic-air-swimmer,

will be reviewed

[bnasslahsen]

@sonic-air-swimmer,

The problem, is your implementation.

Replacing your Bean:

    @Bean
    public FilterRegistrationBean<ForwardedHeaderFilter> forwardedHeaderFilter() {
        ForwardedHeaderFilter filter = new ForwardedHeaderFilter();
        FilterRegistrationBean<ForwardedHeaderFilter> registration = new FilterRegistrationBean<>(filter);
        registration.setDispatcherTypes(DispatcherType.REQUEST, DispatcherType.ASYNC, DispatcherType.ERROR);
        registration.setOrder(Ordered.HIGHEST_PRECEDENCE);
        registration.setUrlPatterns(List.of("/**"));
        return registration;
    }

By the following, as described in the documentation:

	@Bean
	ForwardedHeaderFilter forwardedHeaderFilter() {
		return new ForwardedHeaderFilter();
	}

Solves the problem.

[sonic-air-swimmer]

Hi @bnasslahsen,

Thank you so much for taking time to look on the issue.
I tried it out before and now I realize that it wasn't working previously because it was cached.

I've made it worked by following suggestion from #331