configUrl cache issue when using Swagger-UI

[abenjell]

Describe the bug
Hello,
Our users access swagger using direct access to api : http://localhost:8080/api/v0/swagger-ui/index.html
And other users access the swagger UI behind nginx proxy : http://localhost/api/v0/myservice/swagger-ui/index.html
The problem is the config url is calculated just the first time and used for both access.
The issue is well known and described here

To Reproduce
Steps to reproduce the behavior:
Call swagger ui using nginx proxy : http://localhost/api/v0/myservice/swagger-ui/index.html
Call swagger UI without the proxy : http://localhost:8080/api/v0/swagger-ui/index.html
In the second call we have error message : Failed to load remote configuration.
It's because it makes a call to http://localhost:8080/api/v0/myservice/v3/api-docs/swagger-config that is built the first time when calling the swagger via nginx.

• What version of spring-boot you are using?
  2.6.6
• What modules and versions of springdoc-openapi are you using?
  1.6.9
• What is the actual and the expected result using OpenAPI Description (yml or json)?
• Provide with a sample code (HelloController) or Test that reproduces the problem
  Please find HelloController with nginxConfig
  Expected behavior
  Both URLS work without any impact:
  URL without nginx : http://localhost:8080/api/v0/swagger-ui/index.html
  URL with nginx : http://localhost/api/v0/myservice/swagger-ui/index.html

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

Additional context
Add any other context about the problem here.

Thank you for your help
Best Regards,

[rhu25]

how this is been solved, i am facing same issue

my api
can visit swagger via https://localhost:8081/swagger-ui/index.html

but on my production which is a ui visit swagger via a proxy https://localhost:8082/services/swagger-ui/index.html

how do i handle make both works

[antechrestos]

@abenjell I referenced your issue from mine

[antechrestos]

@abenjell

I made a hack on my side to fix the issue (does not work when two requests from different context path arrives at the same time

public class AlwaysComputeConfigUrlSwaggerTransformer extends SwaggerIndexPageTransformer {

    public AlwaysComputeConfigUrlSwaggerTransformer(SwaggerUiConfigProperties swaggerUiConfig, SwaggerUiOAuthProperties swaggerUiOAuthProperties, SwaggerUiConfigParameters swaggerUiConfigParameters, SwaggerWelcomeCommon swaggerWelcomeCommon, ObjectMapperProvider objectMapperProvider) {
        super(swaggerUiConfig, swaggerUiOAuthProperties, swaggerUiConfigParameters, swaggerWelcomeCommon, objectMapperProvider);
    }

    @Override
    public Resource transform(HttpServletRequest request, Resource resource, ResourceTransformerChain transformerChain) throws IOException {
        this.swaggerUiConfigParameters.setConfigUrl(null); // force parent class to compute data
        return super.transform(request, resource, transformerChain);
    }
}

All you have to do is instanciate it from your @Configuration as the spring doc one is ConditionnalOnMissingBean

This is quite dirty yet, we see that the config url which is an attribute of a Singleton bean is computed for the first request. Hence we are populating application scope data with request scope data.... 😢

Of course I use server.forward-headers-strategy: FRAMEWORK

[bnasslahsen]

should be fixed by #1748

[abenjell]

Hello @bnasslahsen,
This issue was not fixed by #1748
I reproduce the same issue even if i update springdoc-openapi to 1.6.11

[abenjell]

Thank you @antechrestos for your feedback.
but I'm still facing the same issue with springdoc-openapi version = 1.6.11

[licenziato]

The problem is still present even in the springdoc-openapi version = 2.2.0. The only working solution for me is the one proposed by @antechrestos with a SwaggerIndexPageTransformer bean. Any updates on this. It should be reopen disabling the cache cannot be the right solution. For now I fixed also the problem of concurrency using a request scoped bean:

@Bean
@RequestScope
public SwaggerIndexPageTransformer computeConfigUrlSwagger(SwaggerUiConfigProperties swaggerUiConfig,
        SwaggerUiOAuthProperties swaggerUiOAuthProperties, SwaggerUiConfigParameters swaggerUiConfigParameters,
        SwaggerWelcomeCommon swaggerWelcomeCommon, ObjectMapperProvider objectMapperProvider) {
    return new SwaggerIndexPageTransformer(swaggerUiConfig, swaggerUiOAuthProperties, swaggerUiConfigParameters,
            swaggerWelcomeCommon, objectMapperProvider) {
 
        @Override
        public Resource transform(HttpServletRequest request, Resource resource, ResourceTransformerChain transformerChain)
                throws IOException {
            this.swaggerUiConfigParameters.setConfigUrl(null);
            return super.transform(request, resource, transformerChain);
        }
    };
}

[kerner1000]

The workaround by @antechrestos does not work for me, problem is still present. springdoc-openapi-starter-webmvc-ui version 2.2.0.

[robindijkhof]

@bnasslahsen can this be reopened?

[bnasslahsen]

@robindijkhof,

This can be reopened if an issue is confirmed.
You can share a minimal reproducible example , or a failing test in the springdoc project that highlights the issue and will be happy to reopen it.

[yqx1110]

I can confirm this issue still exists with springdoc 2.3.0, when accessing /xxx/swagger-ui/index.html, it uses the cached configUrl, however when accessing /xxx/swagger-ui.html the cached url will be updated and it works, but it redirects to /xxx/swagger-ui/index.html so people will bookmark this address and it will use cached url.