The Hypertext Transfer Protocol (HTTP) is an Application Layer protocol.
GET- request a document.
POST- update a document.
PUT- store a document.
DELETE- delete a document.
HEAD- request a document’s header.
Here’s a GET example:
GET /somedir/page.html HTTP/1.1 Host: tecnico.ulisboa.pt Connection: close User-agent: Mozilla/4.0 Accept-language: en
And a sample response:
HTTP/1.1 200 OK Connection: close Date: Thu, 03 Jul 2013 12:00:15 GMT Server: Caddy Last-Modified: Sun, 5 May 2013 09:23:24 GMT Content-Length: 12234 Content-Type: text/html <html> ...
- One TCP connection for each request.
- One TCP connection can make one or more requests.
- Requests can have arbitrary size.
- Blockage is still possible (Head of Line): replies arrive on the same order.
- Uses binary format instead of text. The headers and request verbs are the same, but they’re encoded differently in a more efficient manner.
- Bidirectional data flux.