Http post请求 entity body的格式

Http post请求 entity body的格式，有三种格式，具体使用哪一种，由消息头当中ContentType的值所决定
1. ContentType:multipart/form-data; boundary=
如：上传文件
POST /api/feed/ HTTP/1.1
Accept-Encoding: gzip
Content-Length: 225873
Content-Type: multipart/form-data; boundary=OCqxMF6-JxtxoMDHmoG5W5eY9MGRsTBp
Host: www.myhost.com
Connection: Keep-Alive

–OCqxMF6-JxtxoMDHmoG5W5eY9MGRsTBp
Content-Disposition: form-data; name=”lng”
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

116.361545
–OCqxMF6-JxtxoMDHmoG5W5eY9MGRsTBp
Content-Disposition: form-data; name=”lat”
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

39.979006
–OCqxMF6-JxtxoMDHmoG5W5eY9MGRsTBp
Content-Disposition: form-data; name=”images”; filename=”/storage/emulated/0/Camera/jdimage/1xh0e3yyfmpr2e35tdowbavrx.jpg”
Content-Type: application/octet-stream
Content-Transfer-Encoding: binary

这里是图片的二进制数据
–OCqxMF6-JxtxoMDHmoG5W5eY9MGRsTBp–

1. ContentType:x-www-form-urlencoded
   如：
   POST http://www.example.com HTTP/1.1
   Content-Type: application/x-www-form-urlencoded;charset=utf-8

title=test&sub%5B%5D=1&sub%5B%5D=2&sub%5B%5D=3

【参考】
1. 关于application/x-www-form-urlencoded等字符编码的
http://blog.sina.com.cn/s/blog_5f1fe33f0100e65s.html
2. postman中 form-data、x-www-form-urlencoded、raw、binary的区别
http://blog.csdn.net/ye1992/article/details/49998511
3.四种常见的 POST 提交数据方式
https://imququ.com/post/four-ways-to-post-data-in-http.html