http: fix bug in Post
http: fix bug in Post

R=rsc
CC=golang-dev
http://codereview.appspot.com/217059

Committer: Russ Cox <5ad239cb8a44f659eaaee0aa1ea5b94947abe557@golang.org>

dsriram/golang,ssrl/go,pombredanne/go-deleteme,nightlyone/golang,ssrl/go,ssrl/go,tianon/debian-golang,apparentlymart/golang,ssrl/go,tianon/debian-golang,h8liu/golang,bdwalton/debian-golang,dsriram/golang,gnanderson/go,dsriram/golang,gnanderson/go,tianon/debian-golang,apparentlymart/golang,h8liu/golang,bdwalton/debian-golang,bdwalton/debian-golang,pombredanne/go-deleteme,gnanderson/go,tianon/debian-golang,tianon/debian-golang,h8liu/golang,tv42/old-go,nightlyone/golang,ssrl/go,dsriram/golang,pombredanne/go-deleteme,nightlyone/golang,tv42/old-go,tv42/old-go,dsriram/golang,nightlyone/golang,bdwalton/debian-golang,gnanderson/go,apparentlymart/golang,ssrl/go,pombredanne/go-deleteme,gnanderson/go,tv42/old-go,tianon/debian-golang,tv42/old-go,gnanderson/go,bdwalton/debian-golang,h8liu/golang,bdwalton/debian-golang,gnanderson/go,tv42/old-go,apparentlymart/golang,dsriram/golang,h8liu/golang,bdwalton/debian-golang,ssrl/go,dsriram/golang,pombredanne/go-deleteme,tianon/debian-golang,pombredanne/go-deleteme,bdwalton/debian-golang,h8liu/golang,apparentlymart/golang,nightlyone/golang,tianon/debian-golang,tv42/old-go,apparentlymart/golang,apparentlymart/golang,pombredanne/go-deleteme,h8liu/golang,nightlyone/golang,nightlyone/golang