diff --git a/client/http/client.go b/client/http/client.go
index fbde326446d..1de05687a2e 100644
--- a/client/http/client.go
+++ b/client/http/client.go
@@ -94,12 +94,12 @@ func NewClient(
 	}
 	c.pdAddrs = pdAddrs
 	// Init the HTTP client if it's not configured.
-	if c.cli != nil {
-		cli := &http.Client{Timeout: defaultTimeout}
+	if c.cli == nil {
+		c.cli = &http.Client{Timeout: defaultTimeout}
 		if c.tlsConf != nil {
 			transport := http.DefaultTransport.(*http.Transport).Clone()
 			transport.TLSClientConfig = c.tlsConf
-			cli.Transport = transport
+			c.cli.Transport = transport
 		}
 	}
 
diff --git a/tests/integrations/client/http_client_test.go b/tests/integrations/client/http_client_test.go
new file mode 100644
index 00000000000..f121ed7a656
--- /dev/null
+++ b/tests/integrations/client/http_client_test.go
@@ -0,0 +1,73 @@
+// Copyright 2023 TiKV Project Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package client_test
+
+import (
+	"context"
+	"testing"
+
+	"github.com/stretchr/testify/suite"
+	pd "github.com/tikv/pd/client/http"
+	"github.com/tikv/pd/tests"
+)
+
+type httpClientTestSuite struct {
+	suite.Suite
+	ctx        context.Context
+	cancelFunc context.CancelFunc
+	cluster    *tests.TestCluster
+	client     pd.Client
+}
+
+func TestHTTPClientTestSuite(t *testing.T) {
+	suite.Run(t, new(httpClientTestSuite))
+}
+
+func (suite *httpClientTestSuite) SetupSuite() {
+	re := suite.Require()
+	var err error
+	suite.ctx, suite.cancelFunc = context.WithCancel(context.Background())
+	suite.cluster, err = tests.NewTestCluster(suite.ctx, 1)
+	re.NoError(err)
+	err = suite.cluster.RunInitialServers()
+	re.NoError(err)
+	leader := suite.cluster.WaitLeader()
+	re.NotEmpty(leader)
+	err = suite.cluster.GetLeaderServer().BootstrapCluster()
+	re.NoError(err)
+	var (
+		testServers = suite.cluster.GetServers()
+		endpoints   = make([]string, 0, len(testServers))
+	)
+	for _, s := range testServers {
+		endpoints = append(endpoints, s.GetConfig().AdvertiseClientUrls)
+	}
+	suite.client = pd.NewClient(endpoints)
+}
+
+func (suite *httpClientTestSuite) TearDownSuite() {
+	suite.cancelFunc()
+	suite.client.Close()
+	suite.cluster.Destroy()
+}
+
+func (suite *httpClientTestSuite) TestGetMinResolvedTSByStoresIDs() {
+	re := suite.Require()
+
+	minResolvedTS, storeMinResolvedTSMap, err := suite.client.GetMinResolvedTSByStoresIDs(suite.ctx, nil)
+	re.NoError(err)
+	re.Greater(minResolvedTS, uint64(0))
+	re.Empty(storeMinResolvedTSMap)
+}