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form表單上傳檔案,

Accept:text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
Accept-Encoding:gzip, deflate, br
Accept-Language:zh-CN,zh;q=0.8
Cache-Control:max-age=0
Connection:keep-alive
Content-Length:1495
Content-Type:multipart/form-data; boundary=----WebKitFormBoundaryA0iAa0dqm6ZugY1G
Host:127.0.0.1:8899
Origin:http://127.0.0.1:8899
Referer:http://127.0.0.1:8899/file/file.html
Upgrade-Insecure-Requests:1
User-Agent:Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.81 Safari/537.36

可是body中是經(jīng)過(guò)編碼的資料

------WebKitFormBoundaryA0iAa0dqm6ZugY1G
Content-Disposition: form-data; name="file"; filename="2.jpg"
Content-Type: image/jpeg


------WebKitFormBoundaryA0iAa0dqm6ZugY1G
Content-Disposition: form-data; name="submit"

Submit
------WebKitFormBoundaryA0iAa0dqm6ZugY1G--

Content-Length與實(shí)際body長(zhǎng)度不符合, 那麼假如我上傳了一個(gè)大檔案, 例如5M, 我在伺服器端想要循環(huán)讀取1M, 該怎麼做呢 ?