diff --git a/client/v2/auth_role.go b/client/v2/auth_role.go
index b6ba7e150..08c300433 100644
--- a/client/v2/auth_role.go
+++ b/client/v2/auth_role.go
@@ -88,7 +88,7 @@ type authRoleAPIList struct{}
 
 func (list *authRoleAPIList) HTTPRequest(ep url.URL) *http.Request {
 	u := v2AuthURL(ep, "roles", "")
-	req, _ := http.NewRequest("GET", u.String(), nil)
+	req, _ := http.NewRequest(http.MethodGet, u.String(), nil)
 	req.Header.Set("Content-Type", "application/json")
 	return req
 }
diff --git a/client/v2/auth_user.go b/client/v2/auth_user.go
index 8e7e2efe8..8ab64e1fb 100644
--- a/client/v2/auth_user.go
+++ b/client/v2/auth_user.go
@@ -163,7 +163,7 @@ type authUserAPIList struct{}
 
 func (list *authUserAPIList) HTTPRequest(ep url.URL) *http.Request {
 	u := v2AuthURL(ep, "users", "")
-	req, _ := http.NewRequest("GET", u.String(), nil)
+	req, _ := http.NewRequest(http.MethodGet, u.String(), nil)
 	req.Header.Set("Content-Type", "application/json")
 	return req
 }
diff --git a/client/v2/keys.go b/client/v2/keys.go
index fa8fdc6b2..8be1057f0 100644
--- a/client/v2/keys.go
+++ b/client/v2/keys.go
@@ -506,7 +506,7 @@ func (g *getAction) HTTPRequest(ep url.URL) *http.Request {
 	params.Set("quorum", strconv.FormatBool(g.Quorum))
 	u.RawQuery = params.Encode()
 
-	req, _ := http.NewRequest("GET", u.String(), nil)
+	req, _ := http.NewRequest(http.MethodGet, u.String(), nil)
 	return req
 }
 
@@ -526,7 +526,7 @@ func (w *waitAction) HTTPRequest(ep url.URL) *http.Request {
 	params.Set("recursive", strconv.FormatBool(w.Recursive))
 	u.RawQuery = params.Encode()
 
-	req, _ := http.NewRequest("GET", u.String(), nil)
+	req, _ := http.NewRequest(http.MethodGet, u.String(), nil)
 	return req
 }
 
@@ -581,7 +581,7 @@ func (a *setAction) HTTPRequest(ep url.URL) *http.Request {
 	u.RawQuery = params.Encode()
 	body := strings.NewReader(form.Encode())
 
-	req, _ := http.NewRequest("PUT", u.String(), body)
+	req, _ := http.NewRequest(http.MethodPut, u.String(), body)
 	req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
 
 	return req
@@ -614,7 +614,7 @@ func (a *deleteAction) HTTPRequest(ep url.URL) *http.Request {
 	}
 	u.RawQuery = params.Encode()
 
-	req, _ := http.NewRequest("DELETE", u.String(), nil)
+	req, _ := http.NewRequest(http.MethodDelete, u.String(), nil)
 	req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
 
 	return req
@@ -637,7 +637,7 @@ func (a *createInOrderAction) HTTPRequest(ep url.URL) *http.Request {
 	}
 	body := strings.NewReader(form.Encode())
 
-	req, _ := http.NewRequest("POST", u.String(), body)
+	req, _ := http.NewRequest(http.MethodPost, u.String(), body)
 	req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
 	return req
 }
diff --git a/client/v2/members.go b/client/v2/members.go
index 5e868ec69..f53c2dbb2 100644
--- a/client/v2/members.go
+++ b/client/v2/members.go
@@ -225,7 +225,7 @@ type membersAPIActionList struct{}
 
 func (l *membersAPIActionList) HTTPRequest(ep url.URL) *http.Request {
 	u := v2MembersURL(ep)
-	req, _ := http.NewRequest("GET", u.String(), nil)
+	req, _ := http.NewRequest(http.MethodGet, u.String(), nil)
 	return req
 }
 
@@ -236,7 +236,7 @@ type membersAPIActionRemove struct {
 func (d *membersAPIActionRemove) HTTPRequest(ep url.URL) *http.Request {
 	u := v2MembersURL(ep)
 	u.Path = path.Join(u.Path, d.memberID)
-	req, _ := http.NewRequest("DELETE", u.String(), nil)
+	req, _ := http.NewRequest(http.MethodDelete, u.String(), nil)
 	return req
 }
 
@@ -248,7 +248,7 @@ func (a *membersAPIActionAdd) HTTPRequest(ep url.URL) *http.Request {
 	u := v2MembersURL(ep)
 	m := memberCreateOrUpdateRequest{PeerURLs: a.peerURLs}
 	b, _ := json.Marshal(&m)
-	req, _ := http.NewRequest("POST", u.String(), bytes.NewReader(b))
+	req, _ := http.NewRequest(http.MethodPost, u.String(), bytes.NewReader(b))
 	req.Header.Set("Content-Type", "application/json")
 	return req
 }
@@ -263,7 +263,7 @@ func (a *membersAPIActionUpdate) HTTPRequest(ep url.URL) *http.Request {
 	m := memberCreateOrUpdateRequest{PeerURLs: a.peerURLs}
 	u.Path = path.Join(u.Path, a.memberID)
 	b, _ := json.Marshal(&m)
-	req, _ := http.NewRequest("PUT", u.String(), bytes.NewReader(b))
+	req, _ := http.NewRequest(http.MethodPut, u.String(), bytes.NewReader(b))
 	req.Header.Set("Content-Type", "application/json")
 	return req
 }
@@ -282,7 +282,7 @@ type membersAPIActionLeader struct{}
 func (l *membersAPIActionLeader) HTTPRequest(ep url.URL) *http.Request {
 	u := v2MembersURL(ep)
 	u.Path = path.Join(u.Path, defaultLeaderSuffix)
-	req, _ := http.NewRequest("GET", u.String(), nil)
+	req, _ := http.NewRequest(http.MethodGet, u.String(), nil)
 	return req
 }
 
diff --git a/contrib/raftexample/raftexample_test.go b/contrib/raftexample/raftexample_test.go
index f7aa335eb..6a8e52746 100644
--- a/contrib/raftexample/raftexample_test.go
+++ b/contrib/raftexample/raftexample_test.go
@@ -200,7 +200,7 @@ func TestPutAndGetKeyValue(t *testing.T) {
 	body := bytes.NewBufferString(wantValue)
 	cli := srv.Client()
 
-	req, err := http.NewRequest("PUT", url, body)
+	req, err := http.NewRequest(http.MethodPut, url, body)
 	if err != nil {
 		t.Fatal(err)
 	}
diff --git a/server/etcdserver/api/etcdhttp/version_test.go b/server/etcdserver/api/etcdhttp/version_test.go
index 25e0c4f3c..3da19bb79 100644
--- a/server/etcdserver/api/etcdhttp/version_test.go
+++ b/server/etcdserver/api/etcdhttp/version_test.go
@@ -24,7 +24,7 @@ import (
 )
 
 func TestServeVersion(t *testing.T) {
-	req, err := http.NewRequest("GET", "", nil)
+	req, err := http.NewRequest(http.MethodGet, "", nil)
 	if err != nil {
 		t.Fatalf("error creating request: %v", err)
 	}
diff --git a/server/etcdserver/api/rafthttp/http_test.go b/server/etcdserver/api/rafthttp/http_test.go
index 8728fce13..fb3e1f66e 100644
--- a/server/etcdserver/api/rafthttp/http_test.go
+++ b/server/etcdserver/api/rafthttp/http_test.go
@@ -187,7 +187,7 @@ func TestServeRaftStreamPrefix(t *testing.T) {
 		},
 	}
 	for i, tt := range tests {
-		req, err := http.NewRequest("GET", "http://localhost:2380"+tt.path, nil)
+		req, err := http.NewRequest(http.MethodGet, "http://localhost:2380"+tt.path, nil)
 		if err != nil {
 			t.Fatalf("#%d: could not create request: %#v", i, err)
 		}
diff --git a/server/etcdserver/api/rafthttp/stream.go b/server/etcdserver/api/rafthttp/stream.go
index c8a1f1fb5..994e080dc 100644
--- a/server/etcdserver/api/rafthttp/stream.go
+++ b/server/etcdserver/api/rafthttp/stream.go
@@ -574,7 +574,7 @@ func (cr *streamReader) dial(t streamType) (io.ReadCloser, error) {
 			zap.String("address", uu.String()),
 		)
 	}
-	req, err := http.NewRequest("GET", uu.String(), nil)
+	req, err := http.NewRequest(http.MethodGet, uu.String(), nil)
 	if err != nil {
 		cr.picker.unreachable(u)
 		return nil, fmt.Errorf("failed to make http request to %v (%v)", u, err)
diff --git a/server/etcdserver/api/rafthttp/util.go b/server/etcdserver/api/rafthttp/util.go
index 91bc6884e..0f8d52071 100644
--- a/server/etcdserver/api/rafthttp/util.go
+++ b/server/etcdserver/api/rafthttp/util.go
@@ -64,7 +64,7 @@ func newStreamRoundTripper(tlsInfo transport.TLSInfo, dialTimeout time.Duration)
 func createPostRequest(lg *zap.Logger, u url.URL, path string, body io.Reader, ct string, urls types.URLs, from, cid types.ID) *http.Request {
 	uu := u
 	uu.Path = path
-	req, err := http.NewRequest("POST", uu.String(), body)
+	req, err := http.NewRequest(http.MethodPost, uu.String(), body)
 	if err != nil {
 		if lg != nil {
 			lg.Panic("unexpected new request error", zap.Error(err))
diff --git a/server/etcdserver/cluster_util.go b/server/etcdserver/cluster_util.go
index dd797baf0..065283a58 100644
--- a/server/etcdserver/cluster_util.go
+++ b/server/etcdserver/cluster_util.go
@@ -289,7 +289,7 @@ func promoteMemberHTTP(ctx context.Context, url string, id uint64, peerRt http.R
 	// TODO: refactor member http handler code
 	// cannot import etcdhttp, so manually construct url
 	requestUrl := url + "/members/promote/" + fmt.Sprintf("%d", id)
-	req, err := http.NewRequest("POST", requestUrl, nil)
+	req, err := http.NewRequest(http.MethodPost, requestUrl, nil)
 	if err != nil {
 		return nil, err
 	}
diff --git a/server/etcdserver/txn/util_test.go b/server/etcdserver/txn/util_test.go
index 1fc9eeac9..096b317d8 100644
--- a/server/etcdserver/txn/util_test.go
+++ b/server/etcdserver/txn/util_test.go
@@ -28,8 +28,8 @@ import (
 // never panic no matter what data the txnResponse contains.
 func TestWarnOfExpensiveReadOnlyTxnRequest(t *testing.T) {
 	kvs := []*mvccpb.KeyValue{
-		&mvccpb.KeyValue{Key: []byte("k1"), Value: []byte("v1")},
-		&mvccpb.KeyValue{Key: []byte("k2"), Value: []byte("v2")},
+		{Key: []byte("k1"), Value: []byte("v1")},
+		{Key: []byte("k2"), Value: []byte("v2")},
 	}
 
 	testCases := []struct {
diff --git a/server/lease/leasehttp/http.go b/server/lease/leasehttp/http.go
index 542c3a82a..30caf22e7 100644
--- a/server/lease/leasehttp/http.go
+++ b/server/lease/leasehttp/http.go
@@ -151,7 +151,7 @@ func RenewHTTP(ctx context.Context, id lease.LeaseID, url string, rt http.RoundT
 	}
 
 	cc := &http.Client{Transport: rt}
-	req, err := http.NewRequest("POST", url, bytes.NewReader(lreq))
+	req, err := http.NewRequest(http.MethodPost, url, bytes.NewReader(lreq))
 	if err != nil {
 		return -1, err
 	}
@@ -202,7 +202,7 @@ func TimeToLiveHTTP(ctx context.Context, id lease.LeaseID, keys bool, url string
 		return nil, err
 	}
 
-	req, err := http.NewRequest("POST", url, bytes.NewReader(lreq))
+	req, err := http.NewRequest(http.MethodPost, url, bytes.NewReader(lreq))
 	if err != nil {
 		return nil, err
 	}
diff --git a/tests/linearizability/model/model.go b/tests/linearizability/model/model.go
index 43a8efe1d..ae00a4b1c 100644
--- a/tests/linearizability/model/model.go
+++ b/tests/linearizability/model/model.go
@@ -404,7 +404,7 @@ func applyRequestToSingleState(s EtcdState, request EtcdRequest) (EtcdState, Etc
 	case LeaseRevoke:
 		//Delete the keys attached to the lease
 		keyDeleted := false
-		for key, _ := range s.Leases[request.LeaseRevoke.LeaseID].Keys {
+		for key := range s.Leases[request.LeaseRevoke.LeaseID].Keys {
 			//same as delete.
 			if _, ok := s.KeyValues[key]; ok {
 				if !keyDeleted {