Spring Cloud Zuul The 'Access-Control-Allow-Origin' header contains multiple values

撸了今年阿里、头条和美团的面试，我有一个重要发现.......>>>

发布Spring Cloud Zuul的时候，前端遇到如下错误： 
The ‘Access-Control-Allow-Origin’ header contains multiple values ‘, ‘, but only one is allowed. 
Origin ‘http://XXXX’ is therefore not allowed access.

参照：https://github.com/spring-cloud/spring-cloud-netflix/issues/1250

在zuul的bootstrap.properties文件中添加：
 

zuul.ignored-headers=Access-Control-Allow-Credentials, Access-Control-Allow-Origin

https://stackoverflow.com/questions/36042862/zuul-proxy-cors-header-contains-multiple-values-headers-repeated-twice-java-s/51419301#51419301