HyperText Transfer Protocol(Http) is an application layer protocol for transmitting hypermedia documents. It is commonly used in network communications nowadays.

HTTP follows a classical client-server model, with client opening a connection to make a request, then waiting until it receives a response. HTTP is a stateless protocol, meaning that server does not keep any data (state) between two requests.

Method

Post

HTTP post sends data to the server. The type of the body is indicated by the Content-type header.

content type

form-data

An HTML form on a web page is a convenient way to configure an HTTP request to send data to server. content of http form in packet:

GET /?say=Hi&to=Mom HTTP/2.0
Host: foo.com

POST / HTTP/2.0
Host: foo.com
Content-Type: application/x-www-form-urlencoded
Content-Length: 13

say=Hi&to=Mom

multipart form-data

one or more different sets of data are combined in a single body, a “multipart” Content-Type must appear in the entity’s header.

POST /foo HTTP/1.1
Content-Length: 68137
Content-Type: multipart/form-data; boundary=---------------------------974767299852498929531610575

-----------------------------974767299852498929531610575
Content-Disposition: form-data; name="description"

some text
-----------------------------974767299852498929531610575
Content-Disposition: form-data; name="myFile"; filename="foo.txt"
Content-Type: text/plain

(content of the uploaded file foo.txt)
-----------------------------974767299852498929531610575--