diff --git a/services/iaasalpha/api_default_test.go b/services/iaasalpha/api_default_test.go
index 678d48093..b0251b527 100644
--- a/services/iaasalpha/api_default_test.go
+++ b/services/iaasalpha/api_default_test.go
@@ -297,7 +297,7 @@ func Test_iaasalpha_DefaultApiService(t *testing.T) {
 		_apiUrlPath = strings.Replace(_apiUrlPath, "{"+"projectId"+"}", url.PathEscape(ParameterValueToString(projectIdValue, "projectId")), -1)
 		serverIdValue := uuid.NewString()
 		_apiUrlPath = strings.Replace(_apiUrlPath, "{"+"serverId"+"}", url.PathEscape(ParameterValueToString(serverIdValue, "serverId")), -1)
-		serviceAccountMailValue := "serviceAccountMail"
+		serviceAccountMailValue := "serviceAccountMail-value"
 		_apiUrlPath = strings.Replace(_apiUrlPath, "{"+"serviceAccountMail"+"}", url.PathEscape(ParameterValueToString(serviceAccountMailValue, "serviceAccountMail")), -1)
 
 		testDefaultApiServeMux := http.NewServeMux()
@@ -1566,7 +1566,7 @@ func Test_iaasalpha_DefaultApiService(t *testing.T) {
 
 	t.Run("Test DefaultApiService DeleteKeyPair", func(t *testing.T) {
 		_apiUrlPath := "/v1alpha1/keypairs/{keypairName}"
-		keypairNameValue := "keypairName"
+		keypairNameValue := "keypairName-value"
 		_apiUrlPath = strings.Replace(_apiUrlPath, "{"+"keypairName"+"}", url.PathEscape(ParameterValueToString(keypairNameValue, "keypairName")), -1)
 
 		testDefaultApiServeMux := http.NewServeMux()
@@ -2551,7 +2551,7 @@ func Test_iaasalpha_DefaultApiService(t *testing.T) {
 
 	t.Run("Test DefaultApiService GetKeyPair", func(t *testing.T) {
 		_apiUrlPath := "/v1alpha1/keypairs/{keypairName}"
-		keypairNameValue := "keypairName"
+		keypairNameValue := "keypairName-value"
 		_apiUrlPath = strings.Replace(_apiUrlPath, "{"+"keypairName"+"}", url.PathEscape(ParameterValueToString(keypairNameValue, "keypairName")), -1)
 
 		testDefaultApiServeMux := http.NewServeMux()
@@ -2605,7 +2605,7 @@ func Test_iaasalpha_DefaultApiService(t *testing.T) {
 		_apiUrlPath := "/v1alpha1/projects/{projectId}/machine-types/{machineType}"
 		projectIdValue := uuid.NewString()
 		_apiUrlPath = strings.Replace(_apiUrlPath, "{"+"projectId"+"}", url.PathEscape(ParameterValueToString(projectIdValue, "projectId")), -1)
-		machineTypeValue := "machineType"
+		machineTypeValue := "machineType-value"
 		_apiUrlPath = strings.Replace(_apiUrlPath, "{"+"machineType"+"}", url.PathEscape(ParameterValueToString(machineTypeValue, "machineType")), -1)
 
 		testDefaultApiServeMux := http.NewServeMux()
@@ -2944,7 +2944,7 @@ func Test_iaasalpha_DefaultApiService(t *testing.T) {
 		_apiUrlPath := "/v1alpha1/organizations/{organizationId}/requests/{requestId}"
 		organizationIdValue := uuid.NewString()
 		_apiUrlPath = strings.Replace(_apiUrlPath, "{"+"organizationId"+"}", url.PathEscape(ParameterValueToString(organizationIdValue, "organizationId")), -1)
-		requestIdValue := "requestId"
+		requestIdValue := "requestId-value"
 		_apiUrlPath = strings.Replace(_apiUrlPath, "{"+"requestId"+"}", url.PathEscape(ParameterValueToString(requestIdValue, "requestId")), -1)
 
 		testDefaultApiServeMux := http.NewServeMux()
@@ -3106,7 +3106,7 @@ func Test_iaasalpha_DefaultApiService(t *testing.T) {
 		_apiUrlPath := "/v1alpha1/projects/{projectId}/requests/{requestId}"
 		projectIdValue := uuid.NewString()
 		_apiUrlPath = strings.Replace(_apiUrlPath, "{"+"projectId"+"}", url.PathEscape(ParameterValueToString(projectIdValue, "projectId")), -1)
-		requestIdValue := "requestId"
+		requestIdValue := "requestId-value"
 		_apiUrlPath = strings.Replace(_apiUrlPath, "{"+"requestId"+"}", url.PathEscape(ParameterValueToString(requestIdValue, "requestId")), -1)
 
 		testDefaultApiServeMux := http.NewServeMux()
@@ -3662,7 +3662,7 @@ func Test_iaasalpha_DefaultApiService(t *testing.T) {
 		_apiUrlPath := "/v1alpha1/projects/{projectId}/volume-performance-classes/{volumePerformanceClass}"
 		projectIdValue := uuid.NewString()
 		_apiUrlPath = strings.Replace(_apiUrlPath, "{"+"projectId"+"}", url.PathEscape(ParameterValueToString(projectIdValue, "projectId")), -1)
-		volumePerformanceClassValue := "volumePerformanceClass"
+		volumePerformanceClassValue := "volumePerformanceClass-value"
 		_apiUrlPath = strings.Replace(_apiUrlPath, "{"+"volumePerformanceClass"+"}", url.PathEscape(ParameterValueToString(volumePerformanceClassValue, "volumePerformanceClass")), -1)
 
 		testDefaultApiServeMux := http.NewServeMux()
@@ -5508,7 +5508,7 @@ func Test_iaasalpha_DefaultApiService(t *testing.T) {
 		_apiUrlPath = strings.Replace(_apiUrlPath, "{"+"projectId"+"}", url.PathEscape(ParameterValueToString(projectIdValue, "projectId")), -1)
 		serverIdValue := uuid.NewString()
 		_apiUrlPath = strings.Replace(_apiUrlPath, "{"+"serverId"+"}", url.PathEscape(ParameterValueToString(serverIdValue, "serverId")), -1)
-		serviceAccountMailValue := "serviceAccountMail"
+		serviceAccountMailValue := "serviceAccountMail-value"
 		_apiUrlPath = strings.Replace(_apiUrlPath, "{"+"serviceAccountMail"+"}", url.PathEscape(ParameterValueToString(serviceAccountMailValue, "serviceAccountMail")), -1)
 
 		testDefaultApiServeMux := http.NewServeMux()
@@ -6352,7 +6352,7 @@ func Test_iaasalpha_DefaultApiService(t *testing.T) {
 
 	t.Run("Test DefaultApiService UpdateKeyPair", func(t *testing.T) {
 		_apiUrlPath := "/v1alpha1/keypairs/{keypairName}"
-		keypairNameValue := "keypairName"
+		keypairNameValue := "keypairName-value"
 		_apiUrlPath = strings.Replace(_apiUrlPath, "{"+"keypairName"+"}", url.PathEscape(ParameterValueToString(keypairNameValue, "keypairName")), -1)
 
 		testDefaultApiServeMux := http.NewServeMux()
diff --git a/services/iaasalpha/client.go b/services/iaasalpha/client.go
index de3841509..acb3cedda 100644
--- a/services/iaasalpha/client.go
+++ b/services/iaasalpha/client.go
@@ -308,7 +308,7 @@ 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)