HTTP常见Content-Type比较

1. application/x-www-form-urlencoded

POST

enctype

application/x-www-form-urlencoded

//例子
//b=曹,a=1

POST  HTTP/1.1(CRLF)
Host: www.example.com(CRLF)
Content-Type: application/x-www-form-urlencoded(CRLF)
Cache-Control: no-cache(CRLF)
(CRLF)
b=%E6%9B%B9&a=1(CRLF)
//这里b参数的值"曹"因为URL转码变成其他的字符串了

2. text/xml

//例子

POST http://www.example.com HTTP/1.1(CRLF)
Content-Type: text/xml(CRLF)
(CRLF)
<?xml version="1.0"?>
<resource>
<id>123</id>
<params>
<name>
<value>homeway</value>
</name>
<age>
<value>22</value>
</age>
</params>
</resource>

3.application/json

//例子
//传递json

POST  HTTP/1.1(CRLF)
Host: www.example.com(CRLF)
Content-Type: application/json(CRLF)
Cache-Control: no-cache(CRLF)
Content-Length: 24(CRLF)
(CRLF)
{
"a":1,
"b":"hello"
}

4. multipart/form-data

form

enctyped

//例子
//a="曹",file1是一个文件

POST  HTTP/1.1(CRLF)
Host: www.example.com(CRLF)
//注意data;和boundary之间有一个空格,并且----WebKitFormBoundary7MA4YWxkTrZu0gW是可以自定义的
Content-Type: multipart/form-data; boundary=----WebKitFormBoundary7MA4YWxkTrZu0gW(CRLF)
Cache-Control: no-cache(CRLF)
Content-Length: 728
(CRLF)
//如果有Content-Length的话，则Content-Length指下面所有的字节总数，包括boundary
//这里用自定义的boundary来进行分割,注意会在头部加多"--"
------WebKitFormBoundary7MA4YWxkTrZu0gW(CRLF)
Content-Disposition: form-data; name="a"(CRLF)
(CRLF)
曹(CRLF)
------WebKitFormBoundary7MA4YWxkTrZu0gW(CRLF)
Content-Disposition: form-data; name="file1"; filename="1.jpg"
Content-Type: application/octet-stream(CRLF)
(CRLF)
//此处是参数file1 对应的文件的二进制数据
[654dfasalk;af&6…](CRLF)
//最后一个boundary会分别在头部和尾部加多"--"
------WebKitFormBoundary7MA4YWxkTrZu0gW--(CRLF)

//多个文件同时上传

POST  HTTP/1.1(CRLF)
Host: www.example.com(CRLF)
//注意data;和boundary之间有一个空格,并且----WebKitFormBoundary7MA4YWxkTrZu0gW是可以自定义的
Content-Type: multipart/form-data; boundary=---------------------------418888951815204591197893077
Cache-Control: no-cache(CRLF)
Content-Length: 12138(CRLF)
(CRLF)
-----------------------------418888951815204591197893077(CRLF)
// 文件1的头部boundary
Content-Disposition: form-data; name="userfile[]"; filename="文件1.md"(CRLF)
Content-Type: text/markdown(CRLF)
(CRLF)
// 文件1内容开始
// ...
// 文件1内容结束
-----------------------------418888951815204591197893077(CRLF)
// 文件2的头部boundary
Content-Disposition: form-data; name="userfile[]"; filename="文件2"(CRLF)
Content-Type: application/octet-stream(CRLF)
(CRLF)
// 文件2内容开始
// ...
// 文件2内容结束
-----------------------------418888951815204591197893077(CRLF)
// 文件3的头部boundary
Content-Disposition: form-data; name="userfile[]"; filename=
4000
"文件3"(CRLF)
Content-Type: application/octet-stream(CRLF)
(CRLF)
// 文件3内容开始
// ...
// 文件3内容结束
-----------------------------418888951815204591197893077(CRLF)
// 参数username的头部boundary
Content-Disposition: form-data; name="username"(CRLF)
(CRLF)
zhangsan
-----------------------------418888951815204591197893077(CRLF)
// 参数password的头部boundary
Content-Disposition: form-data; name="password"(CRLF)
(CRLF)
zhangxx
-----------------------------418888951815204591197893077--
// 尾部boundary，表示结束

(CRLF)

\r\n