文件应该是类似这样的格式：
-- 类似：["Content-Disposition","form-data; name=\"a\"","Content-Disposition: form-data; name=\"a\""]
----B312CA88-3926-4D5D-B70F-38E1FC6C6981
-- Content-Disposition: form-data; name="WechatIMG153.jpeg"; filename="WechatIMG153.jpeg"
-- Content-Transfer-Encoding: binary
-- Content-Type: image/jpeg
