net/http: add method constants
net/http: add method constants

Fixes #12078

Change-Id: Ia8738123b07ca29be4a0cf400ee143729c8b5b3c
Reviewed-on: https://go-review.googlesource.com/16860
Reviewed-by: Andrew Gerrand <395a7d33bec8475c9b83b7d440f141bcbd994aa5@golang.org>
Run-TryBot: Brad Fitzpatrick <ae9783c0b0efc69cd85ab025ddd17aa44cdc4aa5@golang.org>
TryBot-Result: Gobot Gobot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>

derekmarcotte/go,sndnvaps/go,vsekhar/elastic-go,josharian/go,Jordanzuo/go,deft-code/go,akutz/go,miolini/go,ImJasonH/go,cloudflare/go,polyverse-security/go,Endika/go,Samurais/go,ganboing/go-esx,Endika/go,deft-code/go,derekmarcotte/go,nawawi/go,theif519/go,kim-racktop/go,ganboing/go-esx,4ad/go,codestation/go,sndnvaps/go,vsekhar/elastic-go,CAFxX/go,suncycheng/go,miolini/go,polyverse-security/go,akutz/go,kim-racktop/go,suncycheng/go,CAFxX/go,vsekhar/elastic-go,roth1002/go,odeke-em/go,odeke-em/go,ganboing/go-esx,binarycrusader/go,cloudflare/go,ganboing/go-esx,binarycrusader/go,derekmarcotte/go,mwhudson/go,derekmarcotte/go,miolini/go,cloudflare/go,josharian/go,cyberroadie/go,akutz/go,kim-racktop/go,Samurais/go,Jordanzuo/go,ganboing/go-esx,kim-racktop/go,golang/go,nawawi/go,ganboing/go-esx,goodlang/good,vanloswang/go,vanloswang/go,polyverse-security/go,nawawi/go,vsekhar/elastic-go,suncycheng/go,josharian/go,roth1002/go,ImJasonH/go,josharian/go,cyberroadie/go,josharian/go,deft-code/go,cyberroadie/go,4ad/go,goodlang/good,vanloswang/go,polyverse-security/go,goodlang/good,theif519/go,sndnvaps/go,akutz/go,vsekhar/elastic-go,codestation/go,linux-on-ibm-z/go,roth1002/go,odeke-em/go,vanloswang/go,Jordanzuo/go,ganboing/go-esx,sndnvaps/go,Jordanzuo/go,mwhudson/go,linux-on-ibm-z/go,vsekhar/elastic-go,Cofyc/go,momchil-velikov/go,derekmarcotte/go,linux-on-ibm-z/go,binarycrusader/go,vanloswang/go,akutz/go,binarycrusader/go,golang/go,cyberroadie/go,polyverse-security/go,Samurais/go,josharian/go,odeke-em/go,kim-racktop/go,kim-racktop/go,Samurais/go,codestation/go,odeke-em/go,Samurais/go,CAFxX/go,derekmarcotte/go,sndnvaps/go,mwhudson/go,polyverse-security/go,fjballest/golang,golang/go,momchil-velikov/go,cloudflare/go,vanloswang/go,linux-on-ibm-z/go,deft-code/go,linux-on-ibm-z/go,Cofyc/go,4ad/go,roth1002/go,Samurais/go,miolini/go,CAFxX/go,ImJasonH/go,cloudflare/go,theif519/go,akutz/go,linux-on-ibm-z/go,josharian/go,roth1002/go,miolini/go,Samurais/go,cloudflare/go,goodlang/good,vanloswang/go,Endika/go,ImJasonH/go,suncycheng/go,ImJasonH/go,codestation/go,cyberroadie/go,Jordanzuo/go,theif519/go,akutz/go,fjballest/golang,momchil-velikov/go,codestation/go,roth1002/go,odeke-em/go,ImJasonH/go,goodlang/good,Cofyc/go,theif519/go,odeke-em/go,vsekhar/elastic-go,Endika/go,suncycheng/go,mwhudson/go,golang/go,codestation/go,nawawi/go,4ad/go,vsekhar/elastic-go,theif519/go,binarycrusader/go,suncycheng/go,momchil-velikov/go,polyverse-security/go,golang/go,momchil-velikov/go,roth1002/go,Samurais/go,fjballest/golang,mwhudson/go,4ad/go,theif519/go,Endika/go,miolini/go,miolini/go,Cofyc/go,momchil-velikov/go,polyverse-security/go,fjballest/golang,fjballest/golang,cyberroadie/go,Cofyc/go,sndnvaps/go,mwhudson/go,golang/go,fjballest/golang,josharian/go,odeke-em/go,nawawi/go,christopher-henderson/Go,Jordanzuo/go,binarycrusader/go,akutz/go,kim-racktop/go,Cofyc/go,roth1002/go,binarycrusader/go,goodlang/good,linux-on-ibm-z/go,ImJasonH/go,codestation/go,sndnvaps/go,nawawi/go,theif519/go,goodlang/good,Endika/go,deft-code/go,CAFxX/go,deft-code/go,Cofyc/go,goodlang/good,deft-code/go,miolini/go,golang/go,4ad/go,fjballest/golang,fjballest/golang,CAFxX/go,momchil-velikov/go,deft-code/go,Cofyc/go,cloudflare/go,mwhudson/go,nawawi/go,CAFxX/go,kim-racktop/go,cloudflare/go,derekmarcotte/go,mwhudson/go,Endika/go,cyberroadie/go,Jordanzuo/go,suncycheng/go,codestation/go,suncycheng/go,ImJasonH/go,golang/go,sndnvaps/go,4ad/go,nawawi/go,ganboing/go-esx,4ad/go,linux-on-ibm-z/go,Endika/go,derekmarcotte/go,Jordanzuo/go,momchil-velikov/go,cyberroadie/go,CAFxX/go,vanloswang/go,binarycrusader/go