失效代码：

package com.yukuanyan.searcher_web.config;import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.CorsRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;@Configuration
public class WebConfig implements WebMvcConfigurer {@Overridepublic void addCorsMappings(CorsRegistry registry) {registry.addMapping("/**").allowedOrigins("*").allowedMethods("GET", "POST", "PUT", "DELETE").allowedHeaders("*").allowCredentials(true).maxAge(3600);}
}

失效原因：

allowCredentials(true)被设置成了ture，说明浏览器应该在请求时携带凭证（credential），如果使用*作为通配符会导致安全问题，所以会导致通配符

allowedOrigins("*")

失效

 解决方法：
将allowCredentials()设置为false

package com.yukuanyan.searcher_web.config;import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.CorsRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;@Configuration
public class WebConfig implements WebMvcConfigurer {@Overridepublic void addCorsMappings(CorsRegistry registry) {registry.addMapping("/**").allowedOrigins("*").allowedMethods("GET", "POST", "PUT", "DELETE").allowedHeaders("*")// allowOrigins 使用通配符时需要设置为false.allowCredentials(false).maxAge(3600);}
}