#   ZONE
function get-node-env() {
  # TODO(zmerlynn): Make this more reliable with retries.
  gcloud compute --project "${PROJECT}" ssh --zone "${ZONE}" "${NODE_NAMES[0]}" --command \
    "curl --fail --silent -H 'Metadata-Flavor: Google' \
      'http://metadata/computeMetadata/v1/instance/attributes/kube-env'" 2>/dev/null
}

# Read os distro information from /os/release on node.
# $1: The name of node
#
# Assumed vars:

    [parameter(Mandatory=$false)] [string]$Default
  )

  $url = "http://metadata.google.internal/computeMetadata/v1/instance/$Key"
  try {
    $client = New-Object Net.WebClient
    $client.Headers.Add('Metadata-Flavor', 'Google')
    return ($client.DownloadString($url)).Trim()
  }
  catch [System.Net.WebException] {
    if ($Default) {
      return $Default
    }
    else {

	RET

// mach_vm_region_trampoline calls mach_vm_region from libc.
TEXT runtime·mach_vm_region_trampoline(SB),NOSPLIT,$0
	MOVD	0(R0), R1	// address
	MOVD	8(R0), R2	// size
	MOVW	16(R0), R3	// flavor
	MOVD	24(R0), R4	// info
	MOVD	32(R0), R5	// count
	MOVD	40(R0), R6  // object_name
	MOVD	$libc_mach_task_self_(SB), R0
	MOVW	0(R0), R0
	BL	libc_mach_vm_region(SB)
	RET

	RET

// mach_vm_region_trampoline calls mach_vm_region from libc.
TEXT runtime·mach_vm_region_trampoline(SB),NOSPLIT,$0
	MOVQ	0(DI), SI // address
	MOVQ	8(DI), DX // size
	MOVL	16(DI), CX // flavor
	MOVQ	24(DI), R8 // info
	MOVQ	32(DI), R9 // count
	MOVQ	40(DI), R10 // object_name
	MOVQ	$libc_mach_task_self_(SB), DI
	MOVL	0(DI), DI
	CALL	libc_mach_vm_region(SB)
	RET

            </tr>
            <tr>
                <td>org.gradle.nativeplatform.BuildType</td>
            </tr>
            <tr>
                <td>org.gradle.nativeplatform.Flavor</td>
            </tr>
            <tr>
                <td>org.gradle.language.assembler.AssemblerSourceSet</td>
            </tr>
            <tr>
                <td>org.gradle.language.c.CSourceSet</td>

		w.Header().Set("Upgrade", "foo")
		w.Header().Set(fakeHopHeader, "foo")
		w.Header().Add("X-Multi-Value", "foo")
		w.Header().Add("X-Multi-Value", "bar")
		http.SetCookie(w, &http.Cookie{Name: "flavor", Value: "chocolateChip"})
		w.WriteHeader(backendStatus)
		w.Write([]byte(backendResponse))
		w.Header().Set("X-Trailer", "trailer_value")
		w.Header().Set(http.TrailerPrefix+"X-Unannounced-Trailer", "unannounced_trailer_value")

If the type-safe task accessor `tasks.jar` isn't available, see the <<#configuring-plugins,configuring plugins>> section above, you can fallback to using the `tasks` container API. The Kotlin flavor of the following sample is strictly equivalent to the one using the type-safe accessor above:

.Using the `tasks` container API
====

				// curl -H "Metadata-Flavor: Google" 169.254.169.254/computeMetadata/v1/instance/service-accounts/default/identity
				opts := echo.CallOptions{
					Address: "169.254.169.254",
					Port:    echo.Port{ServicePort: 80},
					Scheme:  scheme.HTTP,
					HTTP: echo.HTTP{
						// TODO: detect which platform?
						Headers: headers.New().With("Metadata-Flavor", "Google").Build(),

     * Captures an object to be closed when a {@link ClosingFuture} pipeline is done.
     *
     * <p>For users of the {@code -jre} flavor of Guava, the object can be any {@code
     * AutoCloseable}. For users of the {@code -android} flavor, the object must be a {@code
     * Closeable}. (For more about the flavors, see <a
     * href="https://github.com/google/guava#adding-guava-to-your-build">Adding Guava to your
     * build</a>.)
     *

     * Captures an object to be closed when a {@link ClosingFuture} pipeline is done.
     *
     * <p>For users of the {@code -jre} flavor of Guava, the object can be any {@code
     * AutoCloseable}. For users of the {@code -android} flavor, the object must be a {@code
     * Closeable}. (For more about the flavors, see <a
     * href="https://github.com/google/guava#adding-guava-to-your-build">Adding Guava to your
     * build</a>.)
     *