使用反应为 Spring Cloud Gateway 配置 CORS 不起作用答案

【问题标题】：Configure CORS for Spring Cloud Gateway using react not working使用反应为 Spring Cloud Gateway 配置 CORS 不起作用
【发布时间】：2022-10-19 18:03:32
【问题描述】：

我有一个使用 Spring Cloud Gateway 在本地运行的 React 应用程序。我收到此错误：

adminLogin:1 Access to XMLHttpRequest at 'http://localhost:9191/admin/authenticate' from origin 'http://localhost:3000' has been blocked by CORS policy: The 'Access-Control-Allow-Origin' header contains multiple values 'http://localhost:3000, http://localhost:3000', but only one is allowed.

9191是我的云网关端口号我的云网关yml文件：

server:
  port: 9191

spring:
  application:
    name: API-GATEWAY
  cloud:
    gateway:
      globalcors:
        corsConfigurations:
          '[/**]':
            allowedOrigins: "http://localhost:3000/"
            allowedMethods:
            - GET
            - POST
            - PUT
            - DELETE
        
      routes:
        - id: ADMIN-SERVICE
          uri: lb://ADMIN-SERVICE
          predicates:
            - Path=/admin/**
        - id: CUSTOMER-SERVICE
          uri: lb://CUSTOMER-SERVICE
          predicates:
            - Path=/customer/**
        - id: DEALER-SERVICE
          uri: lb://DEALER-SERVICE
          predicates:
            - Path=/dealer/**
        - id: VENUE-SERVICE
          uri: lb://VENUE-SERVICE
          predicates:
            - Path=/venue/**
      

eureka:
  client:
    fetch-registry: true
    register-with-eureka: true
    service-url:
      defaultZone: http://localhost:8761/eureka/
  instance:
    hostname: localhost

我该如何解决这个问题？

【问题讨论】：

标签： java reactjs spring spring-boot spring-cloud-gateway

【解决方案1】：

反应应用程序面临同样的问题。好像您缺少默认过滤器。我已经在 spring 云网关中使用以下配置修复了 cors ：-

    spring:
  cloud:
    gateway:
      default-filters:
        - DedupeResponseHeader=Access-Control-Allow-Credentials Access-Control-Allow-Origin
      globalcors:
        corsConfigurations:
          '[/**]':
            allowedOrigins: "*"
            allowedMethods: "*"
            allowedHeaders: "*"
      routes:
        - id: portalModule

Spring-Boot v2.7.4， Java v11, spring-cloud-version v2021.0.4

【讨论】：