diff --git a/services/serverbackup/api_default_test.go b/services/serverbackup/api_default_test.go
index 5157f42a2..2883d848a 100644
--- a/services/serverbackup/api_default_test.go
+++ b/services/serverbackup/api_default_test.go
@@ -25,11 +25,11 @@ func Test_serverbackup_DefaultApiService(t *testing.T) {
 
 	t.Run("Test DefaultApiService CreateBackup", func(t *testing.T) {
 		_apiUrlPath := "/v2/projects/{projectId}/regions/{region}/servers/{serverId}/backups"
-		projectIdValue := "projectId"
+		projectIdValue := "projectId-value"
 		_apiUrlPath = strings.Replace(_apiUrlPath, "{"+"projectId"+"}", url.PathEscape(ParameterValueToString(projectIdValue, "projectId")), -1)
-		serverIdValue := "serverId"
+		serverIdValue := "serverId-value"
 		_apiUrlPath = strings.Replace(_apiUrlPath, "{"+"serverId"+"}", url.PathEscape(ParameterValueToString(serverIdValue, "serverId")), -1)
-		regionValue := "region"
+		regionValue := "region-value"
 		_apiUrlPath = strings.Replace(_apiUrlPath, "{"+"region"+"}", url.PathEscape(ParameterValueToString(regionValue, "region")), -1)
 
 		testDefaultApiServeMux := http.NewServeMux()
@@ -83,11 +83,11 @@ func Test_serverbackup_DefaultApiService(t *testing.T) {
 
 	t.Run("Test DefaultApiService CreateBackupSchedule", func(t *testing.T) {
 		_apiUrlPath := "/v2/projects/{projectId}/regions/{region}/servers/{serverId}/backup-schedules"
-		projectIdValue := "projectId"
+		projectIdValue := "projectId-value"
 		_apiUrlPath = strings.Replace(_apiUrlPath, "{"+"projectId"+"}", url.PathEscape(ParameterValueToString(projectIdValue, "projectId")), -1)
-		serverIdValue := "serverId"
+		serverIdValue := "serverId-value"
 		_apiUrlPath = strings.Replace(_apiUrlPath, "{"+"serverId"+"}", url.PathEscape(ParameterValueToString(serverIdValue, "serverId")), -1)
-		regionValue := "region"
+		regionValue := "region-value"
 		_apiUrlPath = strings.Replace(_apiUrlPath, "{"+"region"+"}", url.PathEscape(ParameterValueToString(regionValue, "region")), -1)
 
 		testDefaultApiServeMux := http.NewServeMux()
@@ -141,13 +141,13 @@ func Test_serverbackup_DefaultApiService(t *testing.T) {
 
 	t.Run("Test DefaultApiService DeleteBackup", func(t *testing.T) {
 		_apiUrlPath := "/v2/projects/{projectId}/regions/{region}/servers/{serverId}/backups/{backupId}"
-		projectIdValue := "projectId"
+		projectIdValue := "projectId-value"
 		_apiUrlPath = strings.Replace(_apiUrlPath, "{"+"projectId"+"}", url.PathEscape(ParameterValueToString(projectIdValue, "projectId")), -1)
-		serverIdValue := "serverId"
+		serverIdValue := "serverId-value"
 		_apiUrlPath = strings.Replace(_apiUrlPath, "{"+"serverId"+"}", url.PathEscape(ParameterValueToString(serverIdValue, "serverId")), -1)
-		regionValue := "region"
+		regionValue := "region-value"
 		_apiUrlPath = strings.Replace(_apiUrlPath, "{"+"region"+"}", url.PathEscape(ParameterValueToString(regionValue, "region")), -1)
-		backupIdValue := "backupId"
+		backupIdValue := "backupId-value"
 		_apiUrlPath = strings.Replace(_apiUrlPath, "{"+"backupId"+"}", url.PathEscape(ParameterValueToString(backupIdValue, "backupId")), -1)
 
 		testDefaultApiServeMux := http.NewServeMux()
@@ -196,13 +196,13 @@ func Test_serverbackup_DefaultApiService(t *testing.T) {
 
 	t.Run("Test DefaultApiService DeleteBackupSchedule", func(t *testing.T) {
 		_apiUrlPath := "/v2/projects/{projectId}/regions/{region}/servers/{serverId}/backup-schedules/{backupScheduleId}"
-		projectIdValue := "projectId"
+		projectIdValue := "projectId-value"
 		_apiUrlPath = strings.Replace(_apiUrlPath, "{"+"projectId"+"}", url.PathEscape(ParameterValueToString(projectIdValue, "projectId")), -1)
-		serverIdValue := "serverId"
+		serverIdValue := "serverId-value"
 		_apiUrlPath = strings.Replace(_apiUrlPath, "{"+"serverId"+"}", url.PathEscape(ParameterValueToString(serverIdValue, "serverId")), -1)
-		regionValue := "region"
+		regionValue := "region-value"
 		_apiUrlPath = strings.Replace(_apiUrlPath, "{"+"region"+"}", url.PathEscape(ParameterValueToString(regionValue, "region")), -1)
-		backupScheduleIdValue := "backupScheduleId"
+		backupScheduleIdValue := "backupScheduleId-value"
 		_apiUrlPath = strings.Replace(_apiUrlPath, "{"+"backupScheduleId"+"}", url.PathEscape(ParameterValueToString(backupScheduleIdValue, "backupScheduleId")), -1)
 
 		testDefaultApiServeMux := http.NewServeMux()
@@ -251,15 +251,15 @@ func Test_serverbackup_DefaultApiService(t *testing.T) {
 
 	t.Run("Test DefaultApiService DeleteVolumeBackup", func(t *testing.T) {
 		_apiUrlPath := "/v2/projects/{projectId}/regions/{region}/servers/{serverId}/backups/{backupId}/volume-backups/{volumeBackupId}"
-		projectIdValue := "projectId"
+		projectIdValue := "projectId-value"
 		_apiUrlPath = strings.Replace(_apiUrlPath, "{"+"projectId"+"}", url.PathEscape(ParameterValueToString(projectIdValue, "projectId")), -1)
-		serverIdValue := "serverId"
+		serverIdValue := "serverId-value"
 		_apiUrlPath = strings.Replace(_apiUrlPath, "{"+"serverId"+"}", url.PathEscape(ParameterValueToString(serverIdValue, "serverId")), -1)
-		regionValue := "region"
+		regionValue := "region-value"
 		_apiUrlPath = strings.Replace(_apiUrlPath, "{"+"region"+"}", url.PathEscape(ParameterValueToString(regionValue, "region")), -1)
-		backupIdValue := "backupId"
+		backupIdValue := "backupId-value"
 		_apiUrlPath = strings.Replace(_apiUrlPath, "{"+"backupId"+"}", url.PathEscape(ParameterValueToString(backupIdValue, "backupId")), -1)
-		volumeBackupIdValue := "volumeBackupId"
+		volumeBackupIdValue := "volumeBackupId-value"
 		_apiUrlPath = strings.Replace(_apiUrlPath, "{"+"volumeBackupId"+"}", url.PathEscape(ParameterValueToString(volumeBackupIdValue, "volumeBackupId")), -1)
 
 		testDefaultApiServeMux := http.NewServeMux()
@@ -309,11 +309,11 @@ func Test_serverbackup_DefaultApiService(t *testing.T) {
 
 	t.Run("Test DefaultApiService DisableServiceResource", func(t *testing.T) {
 		_apiUrlPath := "/v2/projects/{projectId}/regions/{region}/servers/{serverId}/service"
-		projectIdValue := "projectId"
+		projectIdValue := "projectId-value"
 		_apiUrlPath = strings.Replace(_apiUrlPath, "{"+"projectId"+"}", url.PathEscape(ParameterValueToString(projectIdValue, "projectId")), -1)
-		serverIdValue := "serverId"
+		serverIdValue := "serverId-value"
 		_apiUrlPath = strings.Replace(_apiUrlPath, "{"+"serverId"+"}", url.PathEscape(ParameterValueToString(serverIdValue, "serverId")), -1)
-		regionValue := "region"
+		regionValue := "region-value"
 		_apiUrlPath = strings.Replace(_apiUrlPath, "{"+"region"+"}", url.PathEscape(ParameterValueToString(regionValue, "region")), -1)
 
 		testDefaultApiServeMux := http.NewServeMux()
@@ -361,11 +361,11 @@ func Test_serverbackup_DefaultApiService(t *testing.T) {
 
 	t.Run("Test DefaultApiService EnableServiceResource", func(t *testing.T) {
 		_apiUrlPath := "/v2/projects/{projectId}/regions/{region}/servers/{serverId}/service"
-		projectIdValue := "projectId"
+		projectIdValue := "projectId-value"
 		_apiUrlPath = strings.Replace(_apiUrlPath, "{"+"projectId"+"}", url.PathEscape(ParameterValueToString(projectIdValue, "projectId")), -1)
-		serverIdValue := "serverId"
+		serverIdValue := "serverId-value"
 		_apiUrlPath = strings.Replace(_apiUrlPath, "{"+"serverId"+"}", url.PathEscape(ParameterValueToString(serverIdValue, "serverId")), -1)
-		regionValue := "region"
+		regionValue := "region-value"
 		_apiUrlPath = strings.Replace(_apiUrlPath, "{"+"region"+"}", url.PathEscape(ParameterValueToString(regionValue, "region")), -1)
 
 		testDefaultApiServeMux := http.NewServeMux()
@@ -413,13 +413,13 @@ func Test_serverbackup_DefaultApiService(t *testing.T) {
 
 	t.Run("Test DefaultApiService GetBackup", func(t *testing.T) {
 		_apiUrlPath := "/v2/projects/{projectId}/regions/{region}/servers/{serverId}/backups/{backupId}"
-		projectIdValue := "projectId"
+		projectIdValue := "projectId-value"
 		_apiUrlPath = strings.Replace(_apiUrlPath, "{"+"projectId"+"}", url.PathEscape(ParameterValueToString(projectIdValue, "projectId")), -1)
-		serverIdValue := "serverId"
+		serverIdValue := "serverId-value"
 		_apiUrlPath = strings.Replace(_apiUrlPath, "{"+"serverId"+"}", url.PathEscape(ParameterValueToString(serverIdValue, "serverId")), -1)
-		regionValue := "region"
+		regionValue := "region-value"
 		_apiUrlPath = strings.Replace(_apiUrlPath, "{"+"region"+"}", url.PathEscape(ParameterValueToString(regionValue, "region")), -1)
-		backupIdValue := "backupId"
+		backupIdValue := "backupId-value"
 		_apiUrlPath = strings.Replace(_apiUrlPath, "{"+"backupId"+"}", url.PathEscape(ParameterValueToString(backupIdValue, "backupId")), -1)
 
 		testDefaultApiServeMux := http.NewServeMux()
@@ -474,13 +474,13 @@ func Test_serverbackup_DefaultApiService(t *testing.T) {
 
 	t.Run("Test DefaultApiService GetBackupSchedule", func(t *testing.T) {
 		_apiUrlPath := "/v2/projects/{projectId}/regions/{region}/servers/{serverId}/backup-schedules/{backupScheduleId}"
-		projectIdValue := "projectId"
+		projectIdValue := "projectId-value"
 		_apiUrlPath = strings.Replace(_apiUrlPath, "{"+"projectId"+"}", url.PathEscape(ParameterValueToString(projectIdValue, "projectId")), -1)
-		serverIdValue := "serverId"
+		serverIdValue := "serverId-value"
 		_apiUrlPath = strings.Replace(_apiUrlPath, "{"+"serverId"+"}", url.PathEscape(ParameterValueToString(serverIdValue, "serverId")), -1)
-		regionValue := "region"
+		regionValue := "region-value"
 		_apiUrlPath = strings.Replace(_apiUrlPath, "{"+"region"+"}", url.PathEscape(ParameterValueToString(regionValue, "region")), -1)
-		backupScheduleIdValue := "backupScheduleId"
+		backupScheduleIdValue := "backupScheduleId-value"
 		_apiUrlPath = strings.Replace(_apiUrlPath, "{"+"backupScheduleId"+"}", url.PathEscape(ParameterValueToString(backupScheduleIdValue, "backupScheduleId")), -1)
 
 		testDefaultApiServeMux := http.NewServeMux()
@@ -535,11 +535,11 @@ func Test_serverbackup_DefaultApiService(t *testing.T) {
 
 	t.Run("Test DefaultApiService GetServiceResource", func(t *testing.T) {
 		_apiUrlPath := "/v2/projects/{projectId}/regions/{region}/servers/{serverId}/service"
-		projectIdValue := "projectId"
+		projectIdValue := "projectId-value"
 		_apiUrlPath = strings.Replace(_apiUrlPath, "{"+"projectId"+"}", url.PathEscape(ParameterValueToString(projectIdValue, "projectId")), -1)
-		serverIdValue := "serverId"
+		serverIdValue := "serverId-value"
 		_apiUrlPath = strings.Replace(_apiUrlPath, "{"+"serverId"+"}", url.PathEscape(ParameterValueToString(serverIdValue, "serverId")), -1)
-		regionValue := "region"
+		regionValue := "region-value"
 		_apiUrlPath = strings.Replace(_apiUrlPath, "{"+"region"+"}", url.PathEscape(ParameterValueToString(regionValue, "region")), -1)
 
 		testDefaultApiServeMux := http.NewServeMux()
@@ -593,7 +593,7 @@ func Test_serverbackup_DefaultApiService(t *testing.T) {
 
 	t.Run("Test DefaultApiService ListBackupPolicies", func(t *testing.T) {
 		_apiUrlPath := "/v2/projects/{projectId}/backup-policies"
-		projectIdValue := "projectId"
+		projectIdValue := "projectId-value"
 		_apiUrlPath = strings.Replace(_apiUrlPath, "{"+"projectId"+"}", url.PathEscape(ParameterValueToString(projectIdValue, "projectId")), -1)
 
 		testDefaultApiServeMux := http.NewServeMux()
@@ -645,11 +645,11 @@ func Test_serverbackup_DefaultApiService(t *testing.T) {
 
 	t.Run("Test DefaultApiService ListBackupSchedules", func(t *testing.T) {
 		_apiUrlPath := "/v2/projects/{projectId}/regions/{region}/servers/{serverId}/backup-schedules"
-		projectIdValue := "projectId"
+		projectIdValue := "projectId-value"
 		_apiUrlPath = strings.Replace(_apiUrlPath, "{"+"projectId"+"}", url.PathEscape(ParameterValueToString(projectIdValue, "projectId")), -1)
-		serverIdValue := "serverId"
+		serverIdValue := "serverId-value"
 		_apiUrlPath = strings.Replace(_apiUrlPath, "{"+"serverId"+"}", url.PathEscape(ParameterValueToString(serverIdValue, "serverId")), -1)
-		regionValue := "region"
+		regionValue := "region-value"
 		_apiUrlPath = strings.Replace(_apiUrlPath, "{"+"region"+"}", url.PathEscape(ParameterValueToString(regionValue, "region")), -1)
 
 		testDefaultApiServeMux := http.NewServeMux()
@@ -703,11 +703,11 @@ func Test_serverbackup_DefaultApiService(t *testing.T) {
 
 	t.Run("Test DefaultApiService ListBackups", func(t *testing.T) {
 		_apiUrlPath := "/v2/projects/{projectId}/regions/{region}/servers/{serverId}/backups"
-		projectIdValue := "projectId"
+		projectIdValue := "projectId-value"
 		_apiUrlPath = strings.Replace(_apiUrlPath, "{"+"projectId"+"}", url.PathEscape(ParameterValueToString(projectIdValue, "projectId")), -1)
-		serverIdValue := "serverId"
+		serverIdValue := "serverId-value"
 		_apiUrlPath = strings.Replace(_apiUrlPath, "{"+"serverId"+"}", url.PathEscape(ParameterValueToString(serverIdValue, "serverId")), -1)
-		regionValue := "region"
+		regionValue := "region-value"
 		_apiUrlPath = strings.Replace(_apiUrlPath, "{"+"region"+"}", url.PathEscape(ParameterValueToString(regionValue, "region")), -1)
 
 		testDefaultApiServeMux := http.NewServeMux()
@@ -761,13 +761,13 @@ func Test_serverbackup_DefaultApiService(t *testing.T) {
 
 	t.Run("Test DefaultApiService RestoreBackup", func(t *testing.T) {
 		_apiUrlPath := "/v2/projects/{projectId}/regions/{region}/servers/{serverId}/backups/{backupId}/restore"
-		projectIdValue := "projectId"
+		projectIdValue := "projectId-value"
 		_apiUrlPath = strings.Replace(_apiUrlPath, "{"+"projectId"+"}", url.PathEscape(ParameterValueToString(projectIdValue, "projectId")), -1)
-		serverIdValue := "serverId"
+		serverIdValue := "serverId-value"
 		_apiUrlPath = strings.Replace(_apiUrlPath, "{"+"serverId"+"}", url.PathEscape(ParameterValueToString(serverIdValue, "serverId")), -1)
-		regionValue := "region"
+		regionValue := "region-value"
 		_apiUrlPath = strings.Replace(_apiUrlPath, "{"+"region"+"}", url.PathEscape(ParameterValueToString(regionValue, "region")), -1)
-		backupIdValue := "backupId"
+		backupIdValue := "backupId-value"
 		_apiUrlPath = strings.Replace(_apiUrlPath, "{"+"backupId"+"}", url.PathEscape(ParameterValueToString(backupIdValue, "backupId")), -1)
 
 		testDefaultApiServeMux := http.NewServeMux()
@@ -816,15 +816,15 @@ func Test_serverbackup_DefaultApiService(t *testing.T) {
 
 	t.Run("Test DefaultApiService RestoreVolumeBackup", func(t *testing.T) {
 		_apiUrlPath := "/v2/projects/{projectId}/regions/{region}/servers/{serverId}/backups/{backupId}/volume-backups/{volumeBackupId}/restore"
-		projectIdValue := "projectId"
+		projectIdValue := "projectId-value"
 		_apiUrlPath = strings.Replace(_apiUrlPath, "{"+"projectId"+"}", url.PathEscape(ParameterValueToString(projectIdValue, "projectId")), -1)
-		serverIdValue := "serverId"
+		serverIdValue := "serverId-value"
 		_apiUrlPath = strings.Replace(_apiUrlPath, "{"+"serverId"+"}", url.PathEscape(ParameterValueToString(serverIdValue, "serverId")), -1)
-		regionValue := "region"
+		regionValue := "region-value"
 		_apiUrlPath = strings.Replace(_apiUrlPath, "{"+"region"+"}", url.PathEscape(ParameterValueToString(regionValue, "region")), -1)
-		backupIdValue := "backupId"
+		backupIdValue := "backupId-value"
 		_apiUrlPath = strings.Replace(_apiUrlPath, "{"+"backupId"+"}", url.PathEscape(ParameterValueToString(backupIdValue, "backupId")), -1)
-		volumeBackupIdValue := "volumeBackupId"
+		volumeBackupIdValue := "volumeBackupId-value"
 		_apiUrlPath = strings.Replace(_apiUrlPath, "{"+"volumeBackupId"+"}", url.PathEscape(ParameterValueToString(volumeBackupIdValue, "volumeBackupId")), -1)
 
 		testDefaultApiServeMux := http.NewServeMux()
@@ -874,13 +874,13 @@ func Test_serverbackup_DefaultApiService(t *testing.T) {
 
 	t.Run("Test DefaultApiService UpdateBackupSchedule", func(t *testing.T) {
 		_apiUrlPath := "/v2/projects/{projectId}/regions/{region}/servers/{serverId}/backup-schedules/{backupScheduleId}"
-		projectIdValue := "projectId"
+		projectIdValue := "projectId-value"
 		_apiUrlPath = strings.Replace(_apiUrlPath, "{"+"projectId"+"}", url.PathEscape(ParameterValueToString(projectIdValue, "projectId")), -1)
-		serverIdValue := "serverId"
+		serverIdValue := "serverId-value"
 		_apiUrlPath = strings.Replace(_apiUrlPath, "{"+"serverId"+"}", url.PathEscape(ParameterValueToString(serverIdValue, "serverId")), -1)
-		regionValue := "region"
+		regionValue := "region-value"
 		_apiUrlPath = strings.Replace(_apiUrlPath, "{"+"region"+"}", url.PathEscape(ParameterValueToString(regionValue, "region")), -1)
-		backupScheduleIdValue := "backupScheduleId"
+		backupScheduleIdValue := "backupScheduleId-value"
 		_apiUrlPath = strings.Replace(_apiUrlPath, "{"+"backupScheduleId"+"}", url.PathEscape(ParameterValueToString(backupScheduleIdValue, "backupScheduleId")), -1)
 
 		testDefaultApiServeMux := http.NewServeMux()
diff --git a/services/serverbackup/client.go b/services/serverbackup/client.go
index 4a94284e3..59e211c78 100644
--- a/services/serverbackup/client.go
+++ b/services/serverbackup/client.go
@@ -305,7 +305,7 @@ func (c *APIClient) prepareRequest(
 	var body *bytes.Buffer
 
 	// Detect postBody type and post.
-	if postBody != nil {
+	if !IsNil(postBody) {
 		contentType := headerParams["Content-Type"]
 		if contentType == "" {
 			contentType = detectContentType(postBody)