客户端POST数据到服务器格式

application/x-www-form-urlencoded

默认类型, 跟GET参数类似, 会urlencode

Content-Type: application/x-www-form-urlencoded

name=todd%2B%2B&age=12

application/form-data

可以上传文件, 在Content-Type里会用boundary分割数据

Content-Type: multipart/form-data; boundary=----WebKitFormBoundary7MA4YWxkTrZu0gW

------WebKitFormBoundary7MA4YWxkTrZu0gW
Content-Disposition: form-data; name="name"

todd++
------WebKitFormBoundary7MA4YWxkTrZu0gW
Content-Disposition: form-data; name="age"

12
------WebKitFormBoundary7MA4YWxkTrZu0gW--

application/json

Content-Type: application/json

{"name": "todd++", "age": 12}