add support for forward proxy#335

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jinglong wants to merge 3 commits intoalibaba:masterfrom

jinglong:proxy-connect

Commits on Nov 4, 2013

add support for forward proxy
jinglong
committed

Commits on Nov 8, 2013

merge nginx 1.4.3
jinglong
committed

Commits on Nov 27, 2013

bugfix: the return value of ngx_http_validate_host has been changed in nginx1.4.4
jinglong
committed