diff --git a/openstack/compute/v2/extensions/secgroups/fixtures.go b/openstack/compute/v2/extensions/secgroups/fixtures.go
index 1c6ba39..8c42e48 100644
--- a/openstack/compute/v2/extensions/secgroups/fixtures.go
+++ b/openstack/compute/v2/extensions/secgroups/fixtures.go
@@ -242,6 +242,7 @@
 
 		w.Header().Add("Content-Type", "application/json")
 		w.WriteHeader(http.StatusAccepted)
+		fmt.Fprintf(w, `{}`)
 	})
 }
 
@@ -261,5 +262,6 @@
 
 		w.Header().Add("Content-Type", "application/json")
 		w.WriteHeader(http.StatusAccepted)
+		fmt.Fprintf(w, `{}`)
 	})
 }
diff --git a/openstack/compute/v2/servers/requests.go b/openstack/compute/v2/servers/requests.go
index 63ad24b..f9839d9 100644
--- a/openstack/compute/v2/servers/requests.go
+++ b/openstack/compute/v2/servers/requests.go
@@ -754,9 +754,7 @@
 // DeleteMetadatum will delete the key-value pair with the given key for the given server ID.
 func DeleteMetadatum(client *gophercloud.ServiceClient, id, key string) DeleteMetadatumResult {
 	var res DeleteMetadatumResult
-	_, res.Err = client.Delete(metadatumURL(client, id, key), &gophercloud.RequestOpts{
-		JSONResponse: &res.Body,
-	})
+	_, res.Err = client.Delete(metadatumURL(client, id, key), nil)
 	return res
 }
 
diff --git a/openstack/networking/v2/extensions/fwaas/firewalls/requests_test.go b/openstack/networking/v2/extensions/fwaas/firewalls/requests_test.go
index f24e283..19d32c5 100644
--- a/openstack/networking/v2/extensions/fwaas/firewalls/requests_test.go
+++ b/openstack/networking/v2/extensions/fwaas/firewalls/requests_test.go
@@ -212,9 +212,9 @@
         "name": "fw",
         "admin_state_up": false,
         "tenant_id": "b4eedccc6fb74fa8a7ad6b08382b852b",
-        "firewall_policy_id": "19ab8c87-4a32-4e6a-a74e-b77fffb89a0c"
+        "firewall_policy_id": "19ab8c87-4a32-4e6a-a74e-b77fffb89a0c",
         "id": "ea5b5315-64f6-4ea3-8e58-981cc37c6576",
-        "description": "OpenStack firewall",
+        "description": "OpenStack firewall"
     }
 }
     `)
diff --git a/openstack/networking/v2/extensions/lbaas/pools/requests_test.go b/openstack/networking/v2/extensions/lbaas/pools/requests_test.go
index 6da29a6..3b5c7c7 100644
--- a/openstack/networking/v2/extensions/lbaas/pools/requests_test.go
+++ b/openstack/networking/v2/extensions/lbaas/pools/requests_test.go
@@ -296,6 +296,7 @@
 
 		w.Header().Add("Content-Type", "application/json")
 		w.WriteHeader(http.StatusCreated)
+		fmt.Fprintf(w, `{}`)
 	})
 
 	_, err := AssociateMonitor(fake.ServiceClient(), "332abe93-f488-41ba-870b-2ac66be7f853", "b624decf-d5d3-4c66-9a3d-f047e7786181").Extract()
diff --git a/openstack/networking/v2/networks/requests_test.go b/openstack/networking/v2/networks/requests_test.go
index a263b7b..81eb79c 100644
--- a/openstack/networking/v2/networks/requests_test.go
+++ b/openstack/networking/v2/networks/requests_test.go
@@ -204,6 +204,7 @@
 		`)
 
 		w.WriteHeader(http.StatusCreated)
+		fmt.Fprintf(w, `{}`)
 	})
 
 	iTrue := true