===========================================curl -H -d
POST /upload HTTP/1.1
Host: baidu.com
User-Agent: curl/7.47.1
Accept: */*
content-type:multipart/form-data;boundary=----8179
Content-Length: 3
a=1
===========================================curl -F
POST /upload HTTP/1.1
Host: baidu.com
User-Agent: curl/7.47.1
Accept: */*
Content-Length: 137
Expect: 100-continue
Content-Type: multipart/form-data; boundary=------------------------a0cdb3147a086812
--------------------------a0cdb3147a086812
Content-Disposition: form-data; name="a"
1
--------------------------a0cdb3147a086812--
使用 wireshark 抓个包,可以明显看出两种格式是很不一样的。