3 :
SMTP , TCP/IP . 25 TCP.
SMTP:
--HELO - SMTP- ,
--MAIL FROM -
--RCPT TO -
--DATA - .
--QUIT - SMTP-
MAIL, :
MAIL FROM: [email protected]
: RCPT TO: [email protected]
, , : DATA
DATA . , . RFC822 , . SMTP - , DATA "." .
POP3 , . 110 TCP.
POP3:
USER [] : --[] -, . .
ASS[] - : - [] - . - .
APOP [][digest] - (digest)
[] -, , [digest]- MD5. Ÿ .
STAT - . . -
LIST[ ] - ( ). []- ( ).
RETR [ ] - . [] - . -
DELE [ ] - . [] - . -
QUIT . .
IMAP4 , . 143 TCP. 2 : , , , .
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23 . http. . TLS/SSL.
HTTP ( ) ( ).
: , ,
: , ,
:1) .
2) , ;
3)
URI , : , , , , ..
URI:<>:<>
URL - .
URL:<>://<>:<>@<>:<>/<URL->
:
OPTIONS HTTP, . -.
GET . . URI. GET.
HEAD GET, , . -, , .
POST . . : , .
PUT .
DELETE .
HTTPS HTTP, SSL/TLS.
SSL/TLS
SSL/TLS , .
.
.
SSL :
- ,
- .
- ,
