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x/net/http/httpguts: add parser/accessors for Link header #31609

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@urandom2

What version of Go are you using (go version)?

$ go version
go version go1.12.4 linux/amd64

Does this issue reproduce with the latest release?

yes

What operating system and processor architecture are you using (go env)?

go env Output
$ go env
GOARCH="amd64"
GOBIN=""
GOCACHE="/home/user/.cache/go-build"
GOEXE=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GOOS="linux"
GOPATH="/home/user/go"
GOPROXY=""
GORACE=""
GOROOT="/usr/lib/go"
GOTMPDIR=""
GOTOOLDIR="/usr/lib/go/pkg/tool/linux_amd64"
GCCGO="gccgo"
CC="gcc"
CXX="g++"
CGO_ENABLED="1"
GOMOD=""
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -m64 -pthread -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build550614768=/tmp/go-build -gno-record-gcc-switches"

What did you do?

I am consuming an API that implements pagination via the link header, see RFC5988.

What did you expect to see?

I hoped that the std lib would have implemented a parser for this bespoke syntax. This could even be done lazily to prevent overhead.

What did you see instead?

I was forced to grab a 3rd party library (e.g. github.com/deiu/linkheader, github.com/tomnomnom/linkheader), or implement the parser myself.

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    FeatureRequestIssues asking for a new feature that does not need a proposal.NeedsInvestigationSomeone must examine and confirm this is a valid issue and not a duplicate of an existing one.

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