updates

src/main/java/com/example/zxweb/utils/RestUtil.java

@@ -9,6 +9,7 @@ import org.springframework.http.converter.StringHttpMessageConverter;
 import org.springframework.web.client.RestTemplate;
 
 import java.nio.charset.StandardCharsets;
+import java.util.Collections;
 import java.util.Iterator;
 import java.util.List;
 import java.util.Map;
@@ -268,6 +269,7 @@ public class RestUtil {
         }
         System.out.println("》》》》》》》》》》》》》》》》》》》》");
         List<String> stringList = responseBodyHeaders.get("Set-Cookie");
+        if (stringList!=null) {
             StringBuilder sb=new StringBuilder();
             for (String s : stringList) {
                 if (s.contains("JSESSIONID") &&!s.contains("deleteMe")) {
@@ -277,7 +279,8 @@ public class RestUtil {
             if (StringUtils.isNotBlank(sb.toString())) {
                 CacheManager.put("Cookie",sb.toString());
             }
-        return RT.exchange(url, method, request, responseType);
+        }
+        return exchange;
     }
 
     /**