Response to preflight request doesn‘t pass access control check: No ‘Access-Control-Allow-Origin‘ he

1. @CrossOrigin annotation solves cross domain

@CrossOrigin(origins = "http://api.gmall.com:8888") // The version of spring must be above 4.2 to achieve cross-domain

If you are also using the spring framework, and the version is above 4.2, you can use the @CrossOrigin annotation, and
the url in the brackets can be replaced with ""*"". If there are multiple methods in this controller, the annotation can be written directly in the class top.


@RestController
@CrossOrigin(origins = "http://api.gmall.com:8888") // 实现跨域  要求spring的版本必须4.2以上
@RequestMapping("/admin/product")
public class ManagerController {
    
    

    @Autowired
    ManagerService managerService;

    @GetMapping("/getCategory1")
    public Result getCategory1(){
    
    
        List<BaseCategory1> category1List = managerService.getCategory1();
        return Result.ok(category1List);
//        return Result.build(category1List, ResultCodeEnum.SUCCESS);
    }
}

2. Write on the class


//写在类上，不用每个方法都写这个注解了
@CrossOrigin(origins="*",maxAge=3600)
@RestController
public class LoginController {
    
    }

3. 1 Configuration class

package com.kd.gmall.gateway.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.cors.CorsConfiguration;
import org.springframework.web.cors.reactive.CorsWebFilter;
import org.springframework.web.cors.reactive.UrlBasedCorsConfigurationSource;

@Configuration
public class CorsConfig {
    
    

    @Bean
    public CorsWebFilter corsWebFilter(){
    
    

        // cors跨域配置对象
        CorsConfiguration configuration = new CorsConfiguration();
        configuration.addAllowedOrigin("*");
        configuration.setAllowCredentials(true);
        configuration.addAllowedMethod("*");
        configuration.addAllowedHeader("*");

        // 配置源对象
        UrlBasedCorsConfigurationSource configurationSource = new UrlBasedCorsConfigurationSource();
        configurationSource.registerCorsConfiguration("/**", configuration);
        // cors过滤器对象
        return new CorsWebFilter(configurationSource);
    }
}

3.2 application.yml

server:
  port: 80
spring:
  application:
    name: api-gateway
  cloud:
    nacos:
      discovery:
        server-addr: 192.168.200.128:8848
    gateway:
      discovery:      #是否与服务发现组件进行结合，通过 serviceId(必须设置成大写) 转发到具体的服务实例。默认为false，设为true便开启通过服务中心的自动根据 serviceId 创建路由的功能。
        locator:      #路由访问方式：http://Gateway_HOST:Gateway_PORT/大写的serviceId/**，其中微服务应用名默认大写访问。
          enabled: true
      routes:
        - id: service-product
          uri: lb://service-product
          predicates:
            - Path=/*/product/** # 路径匹配

3.3 Configuration class directory structure

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