Setting ‘swagger-ui.path’ and ‘swagger-ui.config-url ‘will cause browser to display an incorrect page (Swagger Petstore)

[zxuanhong]

Describe the bug

1. Setting ‘swagger-ui.path’ and ‘swagger-ui.config-url‘ will cause browser to display an incorrect page (swagger Petstore)
2. Configuring only one of them will not cause exceptions

To Reproduce
Steps to reproduce the behavior:

1. https://github.com/springdoc/springdoc-openapi-demos/tree/master/springdoc-openapi-book-service project setting ‘swagger-ui.path’ and ‘swagger-ui.config-url‘
2. application.yml

springdoc:
  version: '@springdoc.version@'
  swagger-ui:
    use-root-path: false
    path: /api/gateway/swagger-ui.html
    config-url: /v3/api-docs/swagger-config
    enabled: true

3. Access doc via address http://localhost:8080/api/gateway/swagger-ui.html
4. Error page displayed
   
5. Eventually eliminate the drop-down will open the page request https://petstore.swagger.io/v2/swagger.json directly, not request /v3/api-docs/swagger-config
6. I never defined the https://petstore.swagger.io/v2/swagger.json address

Help
I want to customize the UI address, as well as the config-URL address, can give a valid configuration

[bnasslahsen]

@Zxiaozhou,

1. First: springdoc.swagger-ui.enabled=true is useless. (It's by default true as explained in the documentation)
   Same for remark applies to springdoc.use-root-pathproperty.

2. Then see Setting springdoc.api-docs.path prevents auto loading of api #1279, configUrl does not include the api gateway route #1144, expose external REST API. Failed to load remote configuration #686 for how people managed to use configUrl.

3. You will understand when you decide to set springdoc.swagger-ui.configUrl manually, then you have to provide the configuration resources in the right path: This is missing from the sample you provided

So make sure your swagger-config.json is located to in static folder - standard spring configuration src/main/resrouces/static - or valid location remote location with CORS enabled.

springdoc.swagger-ui.configUrl=/myapi/swagger-config.json

[jarek-jpa]

it might be important to clearly mention that the content of the swagger-config.json is not the same as the content served from the api-docs endpoint (so setting ?configUrl=/v3/api-docs does not work)
to set the default api-docs url for swagger-ui (as set in the "Explore" input-box) one must create a swagger-config.json in the correct location with content like:

{
  "url": "/v3/api-docs"
}