Requestbody with formstrin is always empty I am sending a post requst via axios axios.post("path", formData ,{ headers: { 'Content-Type': 'multipart/form-data' } }); The payload of this request contains the file content as well as the name,... But @PostMapping("path") fun importCSV(@RequestPart files: MultipartFile?) = service.someaction(files) files is always null (I am using Rest api I in Kotlin).