报错:java.lang.IllegalArgumentException: When allowCredentials is true,
allowedOrigins cannot contain the special value "*"since that cannot be set on the "Access-Control-Allow-Origin"
response header. To allow credentials to a set of origins, list them explicitly or consider using "allowedOriginPatterns" instead.
原因：springboot升级2.4.0后所出现的问题
解决方法：将.allowedOrigins 替换成. allowedOriginPatterns 即可。