Skip to content

Latest commit

 

History

History
54 lines (38 loc) · 1.81 KB

HTTP.md

File metadata and controls

54 lines (38 loc) · 1.81 KB
Raw

HTTP (Hypertext Transfer Protocol)

  • The HTTP client and HTTP server exchange information about resources identified by URLs.

What are HTTP headers?

  • HTTP headers allow the client and the server to pass additional information with the request or the response.
HTTP request header
  • ex) GET /tutorials/other/top-20-mysql-best-practices/ HTTP/1.1
  • method, path, protocol
HTTP response header
  • ex) HTTP/1.x 200 OK

What is HTTP Session?

  • A sequence of network request-response transactions.
  • HTTP client initiates a request -> establishes a TCP connection to a particular port on a host -> wait for a client's request message -> the server receives the request and sends back a status line
  • HTTP -> TCP -> server -> status

What are request methods?

HEAD
  • similar to GET but w/o the response body.
GET
  • requests a representation of the specified resource.
POST
  • submits data to be processed to the identified resource.
PATCH
  • apply partial modification.
DELETE
  • deletes the specified resource.
PUT
  • uploads a representation of the specified resource.
TRACE
  • echoes back the received request.
OPTIONS
  • returns the HTTP methods that the server supports for specified URL.
CONNECT
  • converts the request connection to a transparent TCP/IP tunnel.

Whats are safe methods?

  • methods that are intended only for information retrieval without changing the state of the server.

What is persistent connections?

  • In HTTP/1.1, a keep-alive-mechanism was introduced, where a connection could be reused for more than one request/response pair.

What is HTTP session state?

  • a stateless protocol that does not require the server to retain information or status about each user for the duration of multiple requests. Often solved using HTTP cookies.