The 'Access-Control-Allow-Origin' header contains multiple values

The 'Access-Control-Allow-Origin' header contains multiple values错误是由于设置了相同的跨域信息导致的。解决办法可以参考以下方法：

1. 使用Spring Cloud Gateway解决双重跨域问题。在配置文件中添加以下内容：

spring:
  cloud:
    gateway:
      default-filters:
        - DedupeResponseHeader=Access-Control-Allow-Origin Access-Control-Allow-Credentials, RETAIN_UNIQUE
      globalcors:
        cors-configurations:
          '\[/**\]':
            allowed-origins: "*"
            allowed-methods: "*"
            allowed-headers: "*"
            allow-credentials: true

这样可以确保只有一个Access-Control-Allow-Origin头信息被设置。

2. 在Nginx配置中添加以下内容，更改客户端请求头，确保只有一个Access-Control-Allow-Origin头信息被设置：

location / {
  proxy_set_header Origin '';
  proxy_pass 123.com;
  add_header Access-Control-Allow-Origin "*" always;
}

这样可以通过更改请求头来解决多个Access-Control-Allow-Origin头信息的问题。

请根据具体情况选择适合的解决办法。
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