diff --git a/api/handler/handlers_test.go b/api/handler/handlers_test.go
index 1dc40d3..bf7b41d 100644
--- a/api/handler/handlers_test.go
+++ b/api/handler/handlers_test.go
@@ -4,10 +4,13 @@ import (
 	"bytes"
 	"context"
 	"encoding/xml"
+	"io"
 	"math/rand"
 	"net/http"
 	"net/http/httptest"
+	"strconv"
 	"testing"
+	"time"
 
 	"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
 	"github.com/nspcc-dev/neofs-s3-gw/api"
@@ -17,6 +20,7 @@ import (
 	"github.com/nspcc-dev/neofs-s3-gw/api/resolver"
 	"github.com/nspcc-dev/neofs-s3-gw/internal/neofstest"
 	cid "github.com/nspcc-dev/neofs-sdk-go/container/id"
+	"github.com/nspcc-dev/neofs-sdk-go/object"
 	"github.com/nspcc-dev/neofs-sdk-go/user"
 	"github.com/stretchr/testify/require"
 	"go.uber.org/zap"
@@ -111,12 +115,16 @@ func createTestObject(ctx context.Context, t *testing.T, h *handlerContext, bktI
 	_, err := rand.Read(content)
 	require.NoError(t, err)
 
+	header := map[string]string{
+		object.AttributeTimestamp: strconv.FormatInt(time.Now().UTC().Unix(), 10),
+	}
+
 	_, err = h.Layer().PutObject(ctx, &layer.PutObjectParams{
 		BktInfo: bktInfo,
 		Object:  objName,
 		Size:    int64(len(content)),
 		Reader:  bytes.NewReader(content),
-		Header:  make(map[string]string),
+		Header:  header,
 	})
 	require.NoError(t, err)
 }
@@ -133,3 +141,11 @@ func prepareTestRequest(t *testing.T, bktName, objName string, body interface{})
 
 	return w, r
 }
+
+func assertStatus(t *testing.T, w *httptest.ResponseRecorder, status int) {
+	if w.Code != status {
+		resp, err := io.ReadAll(w.Result().Body)
+		require.NoError(t, err)
+		require.Failf(t, string(resp), "assert status fail, expected: %d, actual: %d", status, w.Code)
+	}
+}
diff --git a/api/handler/head_test.go b/api/handler/head_test.go
new file mode 100644
index 0000000..f6beb27
--- /dev/null
+++ b/api/handler/head_test.go
@@ -0,0 +1,85 @@
+package handler
+
+import (
+	"context"
+	"net/http"
+	"testing"
+	"time"
+
+	"github.com/nspcc-dev/neofs-s3-gw/api"
+	"github.com/stretchr/testify/require"
+)
+
+func TestConditionalHead(t *testing.T) {
+	ctx := context.Background()
+	tc := prepareHandlerContext(t)
+
+	bktName := "bucket-for-conditional"
+	createTestBucket(ctx, t, tc, bktName)
+	bktInfo, err := tc.Layer().GetBucketInfo(ctx, bktName)
+	require.NoError(t, err)
+
+	objName := "object"
+	createTestObject(ctx, t, tc, bktInfo, objName)
+
+	w, r := prepareTestRequest(t, bktName, objName, nil)
+	tc.Handler().HeadObjectHandler(w, r)
+	assertStatus(t, w, http.StatusOK)
+
+	etag := w.Result().Header.Get(api.ETag)
+	lastModified := w.Result().Header.Get(api.LastModified)
+	_ = lastModified
+
+	w, r = prepareTestRequest(t, bktName, objName, nil)
+	r.Header.Set(api.IfMatch, etag)
+	tc.Handler().HeadObjectHandler(w, r)
+	assertStatus(t, w, http.StatusOK)
+
+	w, r = prepareTestRequest(t, bktName, objName, nil)
+	r.Header.Set(api.IfMatch, "etag")
+	tc.Handler().HeadObjectHandler(w, r)
+	assertStatus(t, w, http.StatusPreconditionFailed)
+
+	w, r = prepareTestRequest(t, bktName, objName, nil)
+	r.Header.Set(api.IfUnmodifiedSince, time.Now().UTC().Format(http.TimeFormat))
+	tc.Handler().HeadObjectHandler(w, r)
+	assertStatus(t, w, http.StatusOK)
+
+	var zeroTime time.Time
+	w, r = prepareTestRequest(t, bktName, objName, nil)
+	r.Header.Set(api.IfUnmodifiedSince, zeroTime.UTC().Format(http.TimeFormat))
+	tc.Handler().HeadObjectHandler(w, r)
+	assertStatus(t, w, http.StatusPreconditionFailed)
+
+	w, r = prepareTestRequest(t, bktName, objName, nil)
+	r.Header.Set(api.IfMatch, etag)
+	r.Header.Set(api.IfUnmodifiedSince, zeroTime.UTC().Format(http.TimeFormat))
+	tc.Handler().HeadObjectHandler(w, r)
+	assertStatus(t, w, http.StatusOK)
+
+	w, r = prepareTestRequest(t, bktName, objName, nil)
+	r.Header.Set(api.IfNoneMatch, etag)
+	tc.Handler().HeadObjectHandler(w, r)
+	assertStatus(t, w, http.StatusNotModified)
+
+	w, r = prepareTestRequest(t, bktName, objName, nil)
+	r.Header.Set(api.IfNoneMatch, "etag")
+	tc.Handler().HeadObjectHandler(w, r)
+	assertStatus(t, w, http.StatusOK)
+
+	w, r = prepareTestRequest(t, bktName, objName, nil)
+	r.Header.Set(api.IfModifiedSince, zeroTime.UTC().Format(http.TimeFormat))
+	tc.Handler().HeadObjectHandler(w, r)
+	assertStatus(t, w, http.StatusOK)
+
+	w, r = prepareTestRequest(t, bktName, objName, nil)
+	r.Header.Set(api.IfModifiedSince, time.Now().Add(time.Minute).UTC().Format(http.TimeFormat))
+	tc.Handler().HeadObjectHandler(w, r)
+	assertStatus(t, w, http.StatusNotModified)
+
+	w, r = prepareTestRequest(t, bktName, objName, nil)
+	r.Header.Set(api.IfNoneMatch, etag)
+	r.Header.Set(api.IfModifiedSince, zeroTime.UTC().Format(http.TimeFormat))
+	tc.Handler().HeadObjectHandler(w, r)
+	assertStatus(t, w, http.StatusNotModified)
+}
diff --git a/internal/neofstest/neofs_mock.go b/internal/neofstest/neofs_mock.go
index 77fcf51..1ab7cd2 100644
--- a/internal/neofstest/neofs_mock.go
+++ b/internal/neofstest/neofs_mock.go
@@ -13,6 +13,7 @@ import (
 
 	objectv2 "github.com/nspcc-dev/neofs-api-go/v2/object"
 	"github.com/nspcc-dev/neofs-s3-gw/api/layer/neofs"
+	"github.com/nspcc-dev/neofs-sdk-go/checksum"
 	"github.com/nspcc-dev/neofs-sdk-go/container"
 	cid "github.com/nspcc-dev/neofs-sdk-go/container/id"
 	"github.com/nspcc-dev/neofs-sdk-go/object"
@@ -229,6 +230,9 @@ func (t *TestNeoFS) CreateObject(_ context.Context, prm neofs.PrmObjectCreate) (
 		}
 		obj.SetPayload(all)
 		obj.SetPayloadSize(uint64(len(all)))
+		var hash checksum.Checksum
+		checksum.Calculate(&hash, checksum.SHA256, all)
+		obj.SetPayloadChecksum(hash)
 	}
 
 	cnrID, _ := obj.ContainerID()