如何在Golang中设置GODEBUG环境变量，以便可以在net / http中使用godebug

I want to step through my program using Godebug. However because I'm using net/http I get errors such as:

/home/heath/go/src/net/http/h2_bundle.go:45:2: could not import golang_org/x/net/http2/hpack (cannot find package "golang_org/x/net/http2/hpack" in any of:
    /home/heath/go/src/golang_org/x/net/http2/hpack (from $GOROOT)

/x/net/http2/hpack does exist in my GOPATH but in ~heath/go/src/golang.org ... not golang_org (not sure what's happening there)

I have read that this error occurs because godebug doesn't support http2 yet (can't find source).

I have tried to disable http2server and http2client by setting the GODEBUG env both in init() and on the command line. I have also confirmed that these settings are being set by doing a fmt.Println("GODEBUG", os.Getenv("GODEBUG"). As per instructions located here

GODEBUG=http2client=0  # disable HTTP/2 client support
GODEBUG=http2server=0  # disable HTTP/2 server support

My simple code example to replicate the error is:

  package main

  import "fmt"
  import "net/http"
  import "os"

  func init() {

      os.Setenv("GODEBUG", "http2server=0,http2client=0")

  }

  func main() {

      fmt.Println("GODEBUG", os.Getenv("GODEBUG"))

      _ = "breakpoint"
      fmt.Println("Hello, World!")
      http.ListenAndServe(":8080", nil)
  }

godebug run example.go

I am running Go version:

go version go1.7 linux/amd64