2009-Mar-7 - Mail / FTP / HTTP protocols basis

SMTP:

Commands:

one session:

HELO

MAIL FROM: <...>

RCPT TO: <...>

(RCPT TO: <...>)

DATA

...

.

QUIT

Other commands: RSET, NOOP

Response: 1xx, 2xx, 3xx, 4xx, 5xx

POP3:

Commands: USER, PASS, STAT, LIST, RETR, DELE, NOOP, RSET, QUIT, TOP msg n

Response: +OK, -ERR

IMAP vs. POP3:

IMAP:

• Client does not download the whole mail, only downloads the mail header.
• Client can directly manipulate the mails on server.
• User can maintain the mail directory on server.
• User can retrieve specific part of a mail, eg. text.  

FTP:

Commands: USER, PASS, RETR, TYPE (A/E/I/L), PASV, STOR, DELE, LIST, PWD, NOOP, QUIT, CWD

Response: 1xx, 2xx, 3xx, 4xx, 5xx

HTTP:

Simple:  GET URI HTTP/version

Full:

(General-Header                  - Date / Pragma

 Request-Header                  - From / If-Modified-Since / Referer / User-Agent

 Entity-Header)                     - Content-Encoding / Content-Length / Content-type /

                                               Expires / Last-Modified

 CRLF

[Entity-Body]                       *OCTET

Response:

1xx     informational

2xx     successful

3xx     redirection

4xx     client error

5xx     server error

		Servers	Clients
HTTP	Windows	IIS; Apache	IE; FireFox; Netscape; Mozilla
	Linux	Apache	FireFox; Netscape; Mozilla
FTP	Windows	IIS; ServU	WSFTP; CuteFTP; FFFTP; FlashFTP; SmartFTP
	Linux	proftpd	(command line)
Mail	Windows	IIS; MS Exchange; KerioMailServer	MS Outlook; Outlook Express; Foxmail; Eudora
	Linux	Postfix	(command line)
Proxy	Windows	CCProxy	/
	Linux	squid	/