@@ -27,6 +27,9 @@ func optionsHandler(ctx context.Context, w http.ResponseWriter, r *http.Request,

 }

 func (s *systemRouter) pingHandler(ctx context.Context, w http.ResponseWriter, r *http.Request, vars map[string]string) error {

+	w.Header().Add("Cache-Control", "no-cache, no-store, must-revalidate")

+	w.Header().Add("Pragma", "no-cache")

+

 	builderVersion := build.BuilderVersion(*s.features)

 	if bv := builderVersion; bv != "" {

 		w.Header().Set("Builder-Version", string(bv))

@@ -7115,10 +7115,23 @@ paths:

             Docker-Experimental:

               type: "boolean"

               description: "If the server is running with experimental mode enabled"

+            Cache-Control:

+              type: "string"

+              default: "no-cache, no-store, must-revalidate"

+            Pragma:

+              type: "string"

+              default: "no-cache"

         500:

           description: "server error"

           schema:

             $ref: "#/definitions/ErrorResponse"

+          headers:

+            Cache-Control:

+              type: "string"

+              default: "no-cache, no-store, must-revalidate"

+            Pragma:

+              type: "string"

+              default: "no-cache"

       tags: ["System"]

   /commit:

     post:

@@ -17,6 +17,9 @@ keywords: "API, Docker, rcli, REST, documentation"

 [Docker Engine API v1.40](https://docs.docker.com/engine/api/v1.40/) documentation

+* `GET /_ping` now sets `Cache-Control` and `Pragma` headers to prevent the result

+  from being cached. This change is not versioned, and affects all API versions

+  if the daemon has this patch.

 * `GET /services` now returns `Sysctls` as part of the `ContainerSpec`.

 * `GET /services/{id}` now returns `Sysctls` as part of the `ContainerSpec`.

 * `POST /services/create` now accepts `Sysctls` as part of the `ContainerSpec`.

new file mode 100644

@@ -0,0 +1,29 @@

+package system // import "github.com/docker/docker/integration/system"

+

+import (

+	"net/http"

+	"strings"

+	"testing"

+

+	"github.com/docker/docker/internal/test/request"

+	"gotest.tools/assert"

+)

+

+func TestPingCacheHeaders(t *testing.T) {

+	defer setupTest(t)()

+

+	res, _, err := request.Get("/_ping")

+	assert.NilError(t, err)

+	assert.Equal(t, res.StatusCode, http.StatusOK)

+

+	assert.Equal(t, hdr(res, "Cache-Control"), "no-cache, no-store, must-revalidate")

+	assert.Equal(t, hdr(res, "Pragma"), "no-cache")

+}

+

+func hdr(res *http.Response, name string) string {

+	val, ok := res.Header[http.CanonicalHeaderKey(name)]

+	if !ok || len(val) == 0 {

+		return ""

+	}

+	return strings.Join(val, ", ")

+}