method + header:
POST http://www.example.com HTTP/1.1
Content-Type:multipart/form-data; boundary=----WebKitFormBoundaryrGKCBY7qhFd3TrwA
body:
------WebKitFormBoundaryrGKCBY7qhFd3TrwA
Content-Disposition: form-data; name="images"; filename="1.jpg"
Content-Type: image/jpg
... content of 1.jpg ...
------WebKitFormBoundaryrGKCBY7qhFd3TrwA
Content-Disposition: form-data; name="images"; filename="2.png"
Content-Type: image/png
... content of 2.png ...
------WebKitFormBoundaryrGKCBY7qhFd3TrwA--
参考网址: HTTP 表单编码 enctype
参考网址: HTTP-请求/响应/缓存
参考网址: