问题：在SpringBoot工程中配置跨域请求，启动项目后访问swagger页面报错：

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.
经百度所得，这是SpringBoot升级2.4.0后所出现的问题，博主SpringBoot版本为2.6.*，果然没有逃过这个魔咒。 

解决方案：

CrosConfig.class原配置：

根据问题描述：To allow credentials to a set of origins, list them explicitly or consider using "allowedOriginPatterns" instead，我们可以将allowedOrigins改为 allowedOriginPatterns试试看，修改后CrosConfig.class配置如下：

 此时重启项目并访问swagger页面，错误完美解决。