EDIT 2 (08/25/2017)
; , HTTP2 () . .
( ):
, HTTP/2.0 :
, , , HTTP/1.1 TCP. " " HTTP.
parallelism, , .
HTTP/1.1, (. ), ( ) HTTP-, , URI , , .
, HTTP/2.0 HTTP/1.x, ( 2- > 1, 1- > 2).
.
( ) , HTTP2 , HTTP1. HTTP1 ( "" ) ~ 8 ( ), , HTTP2 . , , , , . , - 8 . :)
HTTP2 , caniuse :)
EDIT (30-11-2015)
" ". , , .
, 2.
-, , HTML, CSS, JS - , PHP/Rails/Django ( 10000+ -) MySQL.
- , . , , .
, (, CSS, JS), HTTP, . , DNS.
DNS, , , . , -.
, , JS CSS JS CSS, . , ( ), JS CSS, -, .
, script -, AJAX. - , script, , .
, , , , , , , -, . !
, first - - , , .
, - .
, - , , , . .. ( ).
HTTP- , , "DNS-" .
, , , javascript async defer.
async , script , , HTML. HTML script.
-. async, HTML .
, "", , , jQuery, -, , async , .
-, "", , google script, - , , :
, JS , , HTML- JS - script , HTML CSS , JS HTML.
HTTP-, , " ", , .
-, http://github.com /fooobar.com/..., , , , .
, , . - -, , , , , , , , . IE/Edge , (, ).
, , , , .
!