springboot how to make the request param case sensitive

My springboot version is 2.0.2 ,My controller could receive the request param, but it could not case sensitive , and the Content-Type: multipart/form-data.

@RequestMapping(value = "/storageFile",method = RequestMethod.POST) 
@ResponseBody public Result storageFile(@Valid RequestEntity requestEntity){

the RequestEntity is a java bean, its field is case insensitive , how ?