fix

server-wx-api/src/main/java/cn/exploring/engine/server/wx/web/StudentController.java

@@ -33,7 +33,7 @@ public class StudentController {
     @PostMapping("add")
     public Object add(@RequestBody StudentInfo studentInfo) {
         String status = studentInfoService.addStudentInfo(studentInfo);
-        return status.contains("OK") ? ResponseUtil.ok(status) : ResponseUtil.fail(502, status);
+        return status.contains("OK") ? ResponseUtil.ok(status) : ResponseUtil.fail(503, status);
     }