summary
multipart 用于在http中高效上传文件
“multipart” or “form-encoded data” is a MIME type which contains multiple files.
优点
‘application/x-www-form-urlencoded’(在multipart之前用于文件上传的方式)需要在文件上传前encoding,multipart不需要
stream each part separately(多个文件,对每个文件支持单独流式传输)
样例
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
| POST /cgi-bin/qtest HTTP/1.1
Content-Type: multipart/form-data; boundary=2a8ae6ad-f4ad-4d9a-a92c-6d217011fe0f
Content-Length: 514
--2a8ae6ad-f4ad-4d9a-a92c-6d217011fe0f
Content-Disposition: form-data; name="datafile1"; filename="r.gif"
Content-Type: image/gif
GIF87a.............,...........D..;
--2a8ae6ad-f4ad-4d9a-a92c-6d217011fe0f
Content-Disposition: form-data; name="datafile2"; filename="g.gif"
Content-Type: image/gif
GIF87a.............,...........D..;
--2a8ae6ad-f4ad-4d9a-a92c-6d217011fe0f
Content-Disposition: form-data; name="datafile3"; filename="b.gif"
Content-Type: image/gif
GIF87a.............,...........D..;
--2a8ae6ad-f4ad-4d9a-a92c-6d217011fe0f--
|
reference