GODEBUG=http2client=0  # disable HTTP/2 client support
	GODEBUG=http2server=0  # disable HTTP/2 server support
	GODEBUG=http2debug=1   # enable verbose HTTP/2 debug logs
	GODEBUG=http2debug=2   # ... even more verbose, with frame dumps

Please report any issues before disabling HTTP/2 support: https://golang.org/s/http2bug

The http package's [Transport] and [Server] both automatically enable

	{Name: "gocachetest", Package: "cmd/go"},
	{Name: "gocacheverify", Package: "cmd/go"},
	{Name: "gotypesalias", Package: "go/types", Changed: 23, Old: "0"},
	{Name: "http2client", Package: "net/http"},
	{Name: "http2debug", Package: "net/http", Opaque: true},
	{Name: "http2server", Package: "net/http"},
	{Name: "httplaxcontentlength", Package: "net/http", Changed: 22, Old: "1"},
	{Name: "httpmuxgo121", Package: "net/http", Changed: 22, Old: "1"},

There is no plan to remove these settings.

### Go 1.6

Go 1.6 introduced transparent support for HTTP/2,
controlled by the [`http2client`, `http2server`, and `http2debug` settings](/pkg/net/http/#hdr-HTTP_2).
There is no plan to remove these settings.

### Go 1.5

Go 1.5 introduced a pure Go DNS resolver,
controlled by the [`netdns` setting](/pkg/net/#hdr-Name_Resolution).

    matchLabels:
      istio: ingressgateway
  template:
    metadata:
      annotations:
        inject.istio.io/templates: gateway
        sidecar.istio.io/componentLogLevel: conn_handler:debug,connection:debug,http:debug
        proxy.istio.io/config: |
          gatewayTopology:
            numTrustedProxies: 1
            proxyProtocol: {}
      labels:
        istio: ingressgateway
        {{ .injectLabel }}
    spec:

	http2logFrameWrites bool
	http2logFrameReads  bool
	http2inTests        bool
)

func init() {
	e := os.Getenv("GODEBUG")
	if strings.Contains(e, "http2debug=1") {
		http2VerboseLogs = true
	}
	if strings.Contains(e, "http2debug=2") {
		http2VerboseLogs = true
		http2logFrameWrites = true
		http2logFrameReads = true
	}
}

const (

  # Update levels of the all loggers
  istioctl proxy-config log <pod-name[.namespace]> --level none

  # Update levels of the specified loggers.
  istioctl proxy-config log <pod-name[.namespace]> --level http:debug,redis:debug

  # Reset levels of all the loggers to default value (warning).
  istioctl proxy-config log <pod-name[.namespace]> -r
`,
		Aliases: []string{"o"},