Spring Cloud Openfeign Feign uses POST to request local service loss parameters

Version 2.2.2 is used in springboot. After springboot is started, send a post request through feignclient, and the local receiving service may not receive the carried parameters. This happens only after springboot is started. The following is the interface code:

@PostMapping(value = "/device/page?auth={auth}",headers = {"Content-Type=application/json"})
String devicePage(@PathVariable String auth,String json);

The local acceptance service can only receive “auth” parameters, but cannot receive “json”. This is not necessary. Is there any solution. This phenomenon is not found in the local service test alone. It only occurs after the springboot service is restarted continuously