话不多说，直接放发大招：网关gateway中yml配置如下：
server:
port: 7010
spring:
cloud:
gateway:
filter:
remove-hop-by-hop:
headers:
# 以下是去掉网关默认去掉的请求响应头
- trailer
- te
- keep-alive
- transfer-encoding
- upgrade
- proxy-authenticate
- connection
- proxy-authorization
- x-application-context
# 以下是去掉服务层面定义的跨域
- access-control-allow-credentials
- access-control-allow-headers
- access-control-allow-methods
- access-control-allow-origin
- access-control-max-age
- vary
globalcors:
corsConfigurations:
'[/**]':
allowCredentials: true
allowedOrigins: "*"
allowedHeaders: "*"
allowedMethods: "*"
maxAge: 3628800
如下图：