java.lang.IllegalArgumentException: When allowCredentials is true, allowedOrigins cannot contain the

今天在做项目的时候，新创建了一个SpringBoot的项目，并且提供了一个接口，但是在局域网内和前端同学进行本地联调的时候出现了跨域的问题。对于这种问题，不想自己手写，也不想麻烦助理，于是直接百度了一下，大概有这么几种方式：

1. 在Controller里面增加@CrossOrigin(“*”)注解

2. 新建一个类，然后去实现WebMvcConfigurer接口，代码大概如下：

   @Configuration
   public class WebConfigurer implements WebMvcConfigurer {
   	@Override
       public void addCorsMappings(CorsRegistry registry) {
           registry.addMapping("/**")
                   .allowedOriginPatterns("*")
                   .allowedMethods("GET", "HEAD", "POST", "PUT", "DELETE", "OPTIONS")
                   .allowCredentials(true)
                   .maxAge(3600)
                   .allowedHeaders("*");
   
       }
   }
   
   

3. 新建一个Filter,代码大概如下：

   
   @Component
   public class CorsFilter implements Filter {
       @Override
       public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
           HttpServletResponse response = (HttpServletResponse) servletResponse;
           response.setHeader("Access-Control-Allow-Origin","*");
           response.setHeader("Access-Control-Allow-Credentials", "true");
           response.setHeader("Access-Control-Allow-Methods","PUT, POST, GET, OPTIONS, DELETE");
           response.setHeader("Access-Control-Max-Age", "3600");
           response.setHeader("Access-Control-Allow-Headers", "content-type, authorization");
           filterChain.doFilter(servletRequest, servletResponse);
       }
   }
   

于是我尝试了第一种办法,发现并没有解决问题；于是我尝试了第二种办法，发现报错了。于是我暂时略过了，尝试第三种办法，发现还是没有解决。于是对于第二种办法我产生了一丝好奇，可以不生效，但是为什么要报错呢？
于是对于该错误我搜索了一下，发现解决办法都是：

public void addCorsMappings(CorsRegistry registry) {
	        registry.addMapping("/**")
	                .allowedOriginPatterns("*") // 将这里由allowedOrigins("*")改成allowedOriginPatterns("*")
	                .allowedMethods("GET", "HEAD", "POST", "PUT", "DELETE", "OPTIONS")
	                .allowCredentials(true)
	                .maxAge(3600)
	                .allowedHeaders("*");
	
	    }

我一查看我的代码，发现，我的代码就是后者allowedOriginPatterns(“*”)啊，那这又是为什么呢？头大。
于是我尝试改了一下这里的代码：

registry.addMapping("/**") // 将这里改成了addMapping("/api/**")
                .allowedOriginPatterns("*")
                .allowedMethods("GET", "HEAD", "POST", "PUT", "DELETE", "OPTIONS")

改完之后我发现请求接口不报错了，哈哈。所以猜测一定是非/api请求的路径导致了这个错误。这个问题暂且不提（后续再跟进）。

于是我根据之前的报错异常debug了一下，找到了报错位置的源代码：
异常信息如下：

2023-12-26 15:58:48.026 ERROR 62817 --- [nio-8801-exec-1] o.a.c.c.C.[.[.[.[dispatcherServlet]      : Servlet.service() for servlet [dispatcherServlet] in context with path [/robot/api] threw exception [Request processing failed; nested exception is 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.] with root cause

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.
	at org.springframework.web.cors.CorsConfiguration.validateAllowCredentials(CorsConfiguration.java:473) ~[spring-web-5.3.28.jar:5.3.28]
	at org.springframework.web.servlet.handler.AbstractHandlerMapping.getHandler(AbstractHandlerMapping.java:532) ~[spring-webmvc-5.3.28.jar:5.3.28]
	at org.springframework.web.servlet.DispatcherServlet.getHandler(DispatcherServlet.java:1266) ~[spring-webmvc-5.3.28.jar:5.3.28]
	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1048) ~[spring-webmvc-5.3.28.jar:5.3.28]
	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:965) ~[spring-webmvc-5.3.28.jar:5.3.28]
	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006) ~[spring-webmvc-5.3.28.jar:5.3.28]
	at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898) ~[spring-webmvc-5.3.28.jar:5.3.28]
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:529) ~[tomcat-embed-core-9.0.76.jar:4.0.FR]
	at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883) ~[spring-webmvc-5.3.28.jar:5.3.28]
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:623) ~[tomcat-embed-core-9.0.76.jar:4.0.FR]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:209) ~[tomcat-embed-core-9.0.76.jar:9.0.76]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:153) ~[tomcat-embed-core-9.0.76.jar:9.0.76]
	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51) ~[tomcat-embed-websocket-9.0.76.jar:9.0.76]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:178) ~[tomcat-embed-core-9.0.76.jar:9.0.76]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:153) ~[tomcat-embed-core-9.0.76.jar:9.0.76]
	at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) ~[spring-web-5.3.28.jar:5.3.28]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117) ~[spring-web-5.3.28.jar:5.3.28]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:178) ~[tomcat-embed-core-9.0.76.jar:9.0.76]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:153) ~[tomcat-embed-core-9.0.76.jar:9.0.76]
	at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) ~[spring-web-5.3.28.jar:5.3.28]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117) ~[spring-web-5.3.28.jar:5.3.28]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:178) ~[tomcat-embed-core-9.0.76.jar:9.0.76]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:153) ~[tomcat-embed-core-9.0.76.jar:9.0.76]
	at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) ~[spring-web-5.3.28.jar:5.3.28]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117) ~[spring-web-5.3.28.jar:5.3.28]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:178) ~[tomcat-embed-core-9.0.76.jar:9.0.76]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:153) ~[tomcat-embed-core-9.0.76.jar:9.0.76]
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:167) ~[tomcat-embed-core-9.0.76.jar:9.0.76]
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:90) [tomcat-embed-core-9.0.76.jar:9.0.76]
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:481) [tomcat-embed-core-9.0.76.jar:9.0.76]
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:130) [tomcat-embed-core-9.0.76.jar:9.0.76]
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:93) [tomcat-embed-core-9.0.76.jar:9.0.76]
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74) [tomcat-embed-core-9.0.76.jar:9.0.76]
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343) [tomcat-embed-core-9.0.76.jar:9.0.76]
	at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:390) [tomcat-embed-core-9.0.76.jar:9.0.76]
	at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:63) [tomcat-embed-core-9.0.76.jar:9.0.76]
	at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:926) [tomcat-embed-core-9.0.76.jar:9.0.76]
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1791) [tomcat-embed-core-9.0.76.jar:9.0.76]
	at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:52) [tomcat-embed-core-9.0.76.jar:9.0.76]
	at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1191) [tomcat-embed-core-9.0.76.jar:9.0.76]
	at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659) [tomcat-embed-core-9.0.76.jar:9.0.76]
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-embed-core-9.0.76.jar:9.0.76]
	at java.lang.Thread.run(Thread.java:748) [na:1.8.0_181]

源码如下：

所以从抛出异常的代码来看，我还是在哪里有设置过allowedOrigins=“*”,可是我在哪里设置了呢？思来想去，我在Controller里面设置了过：

@CrossOrigin("*")

所以，肯定是在这里来的了，于是我把这行代码去掉，把上述的addMapping(“/api/**”) 改成了addMapping(“/**”)，然后确实没有再出现异常了，问题算是暂时解决了。遗留的问题，暂时先不去考虑，等有时间再来探索吧。