【网关异常】/v3/api-docs/default 404

这是所有的配置文件
```
server:
  port: 9000
spring:
  application:
    name: lowcode-gateway
  webflux:
    base-path: /api
  cloud:
    loadbalancer:
      nacos:
        enabled: true
    nacos:
      username: nacos
      password: nacos
      config:
        serverAddr: ${NACOS_HOST:ms.magious.cn}:${NACOS_PORT:8848}
      discovery:
        server-addr: ${NACOS_HOST:ms.magious.cn}:${NACOS_PORT:8848}
    gateway:
      metrics:
        enabled: true
      discovery:
        locator:
          enabled: true
          lower-case-service-id: true
          predicates:
            - Path='/api/'+serviceId+'/**'
          filters:
            - StripBasePath=1
            - StripPrefix=1
      globalcors: # 全局的跨域处理
        add-to-simple-url-handler-mapping: true # 解决options请求被拦截问题
        corsConfigurations:
          '[/**]':
            allowedOrigins: # 允许哪些网站的跨域请求 
              - "http://localhost:9527"
              - "http://localhost:9020"
              - "http://localhost"
            allowedMethods: # 允许的跨域ajax的请求方式
              - "GET"
              - "POST"
              - "DELETE"
              - "PUT"
              - "OPTIONS"
            allowedHeaders: "*" # 允许在请求中携带的头信息
            allowCredentials: true # 是否允许携带cookie
            maxAge: 360000 # 这次跨域检测的有效期
  config:
    import:
      - nacos:test-config.yml?refresh=true

management:
  endpoint:
    health:
      show-details: always
  endpoints:
    web:
      exposure:
        include: '*'
logging:
  level:
    com.alibaba.cloud.nacos: debug
    org.springframework.cloud.gateway: trace

springdoc:
  default-flat-param-object: true
knife4j:
  gateway:
    enabled: true
    strategy: discover
    discover:
      enabled: true
      # 指定版本号(Swagger2|OpenAPI3)
      version: openapi3
      # 需要排除的微服务(eg:网关服务)
      excluded-services:
        - lowcode-gateway
```

要用这种代码，不然会导致异常   @foxjc

[异常说明](https://github.com/springdoc/springdoc-openapi/issues/2341)

~~~
@Configuration
public class CustomUrlMappingConfiguration {

@Value("${spring.application.name}")
    private String applicationName;

@Bean
    public SimpleUrlHandlerMapping customUrlHandlerMapping() {
        SimpleUrlHandlerMapping mapping = new SimpleUrlHandlerMapping();
        mapping.setOrder(1);
        Map<String, Object> urlMap = new HashMap<>(4);
        urlMap.put("/" + applicationName + "/v3/api-docs/{param}", parameterizableViewController("v3/api-docs/{param}"));
        urlMap.put("/" + applicationName + "/v3/api-docs", parameterizableViewController("v3/api-docs"));
        urlMap.put("/" + applicationName + "/v3/api-docs/default", parameterizableViewController("v3/api-docs"));
        mapping.setUrlMap(urlMap);
        return mapping;
    }

private ParameterizableViewController parameterizableViewController(String viewName) {
        ParameterizableViewController controller = new ParameterizableViewController();
        controller.setViewName("forward:/" + viewName);
        return controller;
    }
}
~~~

GVP 萧明/knife4j

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GVP萧明/knife4j

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