SpringBoot升級2.4.0所出現的問題：
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.

解決方案：
跨域配置報錯，將.allowedOrigins替換成.allowedOriginPatterns即可。
調整前：

package com.course.server.config;import org.springframework.context.annotation.Configuration; import org.springframework.web.cors.CorsConfiguration; import org.springframework.web.servlet.config.annotation.CorsRegistry; import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;@Configuration public class CorsConfig implements WebMvcConfigurer {@Overridepublic void addCorsMappings(CorsRegistry registry) {// 設置允許跨域的路由registry.addMapping("/**")// 設置允許跨域請求的域名.allowedOrigins("*").allowedHeaders(CorsConfiguration.ALL)// 設置允許的方法.allowedMethods(CorsConfiguration.ALL)// 是否允許證書（cookies）.allowCredentials(true)// 跨域允許時間.maxAge(3600);//1小時內不需要校驗，發送OPTIONS請求} }

調整后：

package com.course.server.config;import org.springframework.context.annotation.Configuration; import org.springframework.web.cors.CorsConfiguration; import org.springframework.web.servlet.config.annotation.CorsRegistry; import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;@Configuration public class CorsConfig implements WebMvcConfigurer {@Overridepublic void addCorsMappings(CorsRegistry registry) {// 設置允許跨域的路由registry.addMapping("/**")// 設置允許跨域請求的域名.allowedOriginPatterns("*").allowedHeaders(CorsConfiguration.ALL)// 設置允許的方法.allowedMethods(CorsConfiguration.ALL)// 是否允許證書（cookies）.allowCredentials(true)// 跨域允許時間.maxAge(3600);//1小時內不需要校驗，發送OPTIONS請求} }

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