feign調用文件上傳服務，傳參MultipartFile

Required request part 'file' is not present

將MultypartFile name 設為 接口參數。

        MultipartFile multipartFile = new MockMultipartFile("file", fileName,
                ContentType.MULTIPART.toString(), new FileInputStream(file));
        return this.fileUploadFeign.handleFileUpload(multipartFile);

定義feign接口：

    @PostMapping(value = "/v1/files", consumes = "multipart/*", headers = "content-type=multipart/form-data")
    String handleFileUpload(@RequestPart("file") MultipartFile file);