diff --git a/apps/vtn/vtnweb/src/main/java/org/onosproject/vtnweb/resources/FloatingIpWebResource.java b/apps/vtn/vtnweb/src/main/java/org/onosproject/vtnweb/resources/FloatingIpWebResource.java
index d4b269c..c5ddb07 100644
--- a/apps/vtn/vtnweb/src/main/java/org/onosproject/vtnweb/resources/FloatingIpWebResource.java
+++ b/apps/vtn/vtnweb/src/main/java/org/onosproject/vtnweb/resources/FloatingIpWebResource.java
@@ -15,21 +15,25 @@
  */
 package org.onosproject.vtnweb.resources;
 
-import static com.google.common.base.Preconditions.checkNotNull;
-import static javax.ws.rs.core.Response.Status.BAD_REQUEST;
-import static javax.ws.rs.core.Response.Status.NOT_FOUND;
-import static javax.ws.rs.core.Response.Status.CREATED;
-import static javax.ws.rs.core.Response.Status.CONFLICT;
-import static javax.ws.rs.core.Response.Status.NO_CONTENT;
-
-import java.io.IOException;
-import java.io.InputStream;
-import java.util.Collection;
-import java.util.Collections;
-import java.util.HashMap;
-import java.util.List;
-import java.util.Map;
-import java.util.Set;
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.databind.node.ObjectNode;
+import com.google.common.collect.Sets;
+import org.onlab.packet.IpAddress;
+import org.onlab.util.ItemNotFoundException;
+import org.onosproject.rest.AbstractWebResource;
+import org.onosproject.vtnrsc.DefaultFloatingIp;
+import org.onosproject.vtnrsc.FloatingIp;
+import org.onosproject.vtnrsc.FloatingIp.Status;
+import org.onosproject.vtnrsc.FloatingIpId;
+import org.onosproject.vtnrsc.RouterId;
+import org.onosproject.vtnrsc.TenantId;
+import org.onosproject.vtnrsc.TenantNetworkId;
+import org.onosproject.vtnrsc.VirtualPortId;
+import org.onosproject.vtnrsc.floatingip.FloatingIpService;
+import org.onosproject.vtnweb.web.FloatingIpCodec;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 import javax.ws.rs.Consumes;
 import javax.ws.rs.DELETE;
@@ -42,27 +46,20 @@
 import javax.ws.rs.QueryParam;
 import javax.ws.rs.core.MediaType;
 import javax.ws.rs.core.Response;
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
 
-import org.onlab.packet.IpAddress;
-import org.onlab.util.ItemNotFoundException;
-import org.onosproject.rest.AbstractWebResource;
-import org.onosproject.vtnrsc.DefaultFloatingIp;
-import org.onosproject.vtnrsc.FloatingIp;
-import org.onosproject.vtnrsc.FloatingIpId;
-import org.onosproject.vtnrsc.TenantId;
-import org.onosproject.vtnrsc.TenantNetworkId;
-import org.onosproject.vtnrsc.VirtualPortId;
-import org.onosproject.vtnrsc.RouterId;
-import org.onosproject.vtnrsc.FloatingIp.Status;
-import org.onosproject.vtnrsc.floatingip.FloatingIpService;
-import org.onosproject.vtnweb.web.FloatingIpCodec;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-
-import com.fasterxml.jackson.databind.JsonNode;
-import com.fasterxml.jackson.databind.ObjectMapper;
-import com.fasterxml.jackson.databind.node.ObjectNode;
-import com.google.common.collect.Sets;
+import static com.google.common.base.Preconditions.checkNotNull;
+import static javax.ws.rs.core.Response.Status.BAD_REQUEST;
+import static javax.ws.rs.core.Response.Status.CONFLICT;
+import static javax.ws.rs.core.Response.Status.CREATED;
+import static javax.ws.rs.core.Response.Status.NOT_FOUND;
 
 @Path("floatingips")
 public class FloatingIpWebResource extends AbstractWebResource {
@@ -165,7 +162,7 @@
             if (!result) {
                 return Response.status(CONFLICT).entity(DELETE_FAIL).build();
             }
-            return Response.status(NO_CONTENT).entity(DELETE_SUCCESS).build();
+            return Response.noContent().entity(DELETE_SUCCESS).build();
         } catch (Exception e) {
             return Response.status(NOT_FOUND).entity(e.getMessage()).build();
         }
diff --git a/apps/vtn/vtnweb/src/main/java/org/onosproject/vtnweb/resources/FlowClassifierWebResource.java b/apps/vtn/vtnweb/src/main/java/org/onosproject/vtnweb/resources/FlowClassifierWebResource.java
index 6099769..10cb399 100644
--- a/apps/vtn/vtnweb/src/main/java/org/onosproject/vtnweb/resources/FlowClassifierWebResource.java
+++ b/apps/vtn/vtnweb/src/main/java/org/onosproject/vtnweb/resources/FlowClassifierWebResource.java
@@ -149,16 +149,16 @@
     /**
      * Delete details of a flow classifier.
      *
-     * @param id
-     *            flow classifier id
+     * @param id flow classifier id
+     * @return 204 NO CONTENT
      */
     @Path("{flow_id}")
     @DELETE
-    public void deleteFlowClassifier(@PathParam("flow_id") String id) {
+    public Response deleteFlowClassifier(@PathParam("flow_id") String id) {
         log.debug("Deletes flow classifier by identifier {}.", id);
         FlowClassifierId flowClassifierId = FlowClassifierId.of(id);
         Boolean issuccess = nullIsNotFound(get(FlowClassifierService.class).removeFlowClassifier(flowClassifierId),
                                            FLOW_CLASSIFIER_NOT_FOUND);
-
+        return Response.noContent().build();
     }
 }
diff --git a/apps/vtn/vtnweb/src/main/java/org/onosproject/vtnweb/resources/PortChainWebResource.java b/apps/vtn/vtnweb/src/main/java/org/onosproject/vtnweb/resources/PortChainWebResource.java
index 81e2940..d5948cc 100644
--- a/apps/vtn/vtnweb/src/main/java/org/onosproject/vtnweb/resources/PortChainWebResource.java
+++ b/apps/vtn/vtnweb/src/main/java/org/onosproject/vtnweb/resources/PortChainWebResource.java
@@ -146,10 +146,11 @@
      * Delete details of a specified port chain id.
      *
      * @param id port chain id
+     * @return 204 NO CONTENT
      */
     @Path("{chain_id}")
     @DELETE
-    public void deletePortPain(@PathParam("chain_id") String id) {
+    public Response deletePortPain(@PathParam("chain_id") String id) {
         log.debug("Deletes port chain by identifier {}.", id);
         PortChainId portChainId = PortChainId.of(id);
 
@@ -158,5 +159,6 @@
         if (!issuccess) {
             log.debug("Port Chain identifier {} does not exist", id);
         }
+        return Response.noContent().build();
     }
 }
diff --git a/apps/vtn/vtnweb/src/main/java/org/onosproject/vtnweb/resources/PortPairGroupWebResource.java b/apps/vtn/vtnweb/src/main/java/org/onosproject/vtnweb/resources/PortPairGroupWebResource.java
index 34fe255..68fc6bd 100644
--- a/apps/vtn/vtnweb/src/main/java/org/onosproject/vtnweb/resources/PortPairGroupWebResource.java
+++ b/apps/vtn/vtnweb/src/main/java/org/onosproject/vtnweb/resources/PortPairGroupWebResource.java
@@ -153,10 +153,11 @@
      * Delete details of a specified port pair group id.
      *
      * @param id port pair group id
+     * @return 204 NO CONTENT
      */
     @Path("{group_id}")
     @DELETE
-    public void deletePortPairGroup(@PathParam("group_id") String id) {
+    public Response deletePortPairGroup(@PathParam("group_id") String id) {
         log.debug("Deletes port pair group by identifier {}.", id);
         PortPairGroupId portPairGroupId = PortPairGroupId.of(id);
         Boolean issuccess = nullIsNotFound(get(PortPairGroupService.class).removePortPairGroup(portPairGroupId),
@@ -164,5 +165,7 @@
         if (!issuccess) {
             log.debug("Port pair group identifier {} does not exist", id);
         }
+
+        return Response.noContent().build();
     }
 }
diff --git a/apps/vtn/vtnweb/src/main/java/org/onosproject/vtnweb/resources/PortPairWebResource.java b/apps/vtn/vtnweb/src/main/java/org/onosproject/vtnweb/resources/PortPairWebResource.java
index 5b4945c..34bea37 100644
--- a/apps/vtn/vtnweb/src/main/java/org/onosproject/vtnweb/resources/PortPairWebResource.java
+++ b/apps/vtn/vtnweb/src/main/java/org/onosproject/vtnweb/resources/PortPairWebResource.java
@@ -145,15 +145,17 @@
      * Delete details of a specified port pair id.
      *
      * @param id port pair id
+     * @return 204 NO CONTENT
      */
     @Path("{pair_id}")
     @DELETE
-    public void deletePortPair(@PathParam("pair_id") String id) {
+    public Response deletePortPair(@PathParam("pair_id") String id) {
 
         PortPairId portPairId = PortPairId.of(id);
         Boolean isSuccess = nullIsNotFound(get(PortPairService.class).removePortPair(portPairId), PORT_PAIR_NOT_FOUND);
         if (!isSuccess) {
             log.debug("Port pair identifier {} does not exist", id);
         }
+        return Response.noContent().build();
     }
 }
diff --git a/apps/vtn/vtnweb/src/main/java/org/onosproject/vtnweb/resources/RouterWebResource.java b/apps/vtn/vtnweb/src/main/java/org/onosproject/vtnweb/resources/RouterWebResource.java
index d7389b7..f8b87cc 100644
--- a/apps/vtn/vtnweb/src/main/java/org/onosproject/vtnweb/resources/RouterWebResource.java
+++ b/apps/vtn/vtnweb/src/main/java/org/onosproject/vtnweb/resources/RouterWebResource.java
@@ -15,37 +15,11 @@
  */
 package org.onosproject.vtnweb.resources;
 
-import static com.google.common.base.Preconditions.checkArgument;
-import static com.google.common.base.Preconditions.checkNotNull;
-import static javax.ws.rs.core.Response.Status.BAD_REQUEST;
-import static javax.ws.rs.core.Response.Status.CONFLICT;
-import static javax.ws.rs.core.Response.Status.CREATED;
-import static javax.ws.rs.core.Response.Status.NOT_FOUND;
-import static javax.ws.rs.core.Response.Status.NO_CONTENT;
-
-import java.io.IOException;
-import java.io.InputStream;
-import java.util.ArrayList;
-import java.util.Collection;
-import java.util.Collections;
-import java.util.HashMap;
-import java.util.List;
-import java.util.Map;
-import java.util.Set;
-import java.util.concurrent.ConcurrentMap;
-
-import javax.ws.rs.Consumes;
-import javax.ws.rs.DELETE;
-import javax.ws.rs.GET;
-import javax.ws.rs.POST;
-import javax.ws.rs.PUT;
-import javax.ws.rs.Path;
-import javax.ws.rs.PathParam;
-import javax.ws.rs.Produces;
-import javax.ws.rs.QueryParam;
-import javax.ws.rs.core.MediaType;
-import javax.ws.rs.core.Response;
-
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.databind.node.ObjectNode;
+import com.google.common.collect.Maps;
+import com.google.common.collect.Sets;
 import org.onlab.packet.IpAddress;
 import org.onlab.util.ItemNotFoundException;
 import org.onosproject.rest.AbstractWebResource;
@@ -66,11 +40,34 @@
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-import com.fasterxml.jackson.databind.JsonNode;
-import com.fasterxml.jackson.databind.ObjectMapper;
-import com.fasterxml.jackson.databind.node.ObjectNode;
-import com.google.common.collect.Maps;
-import com.google.common.collect.Sets;
+import javax.ws.rs.Consumes;
+import javax.ws.rs.DELETE;
+import javax.ws.rs.GET;
+import javax.ws.rs.POST;
+import javax.ws.rs.PUT;
+import javax.ws.rs.Path;
+import javax.ws.rs.PathParam;
+import javax.ws.rs.Produces;
+import javax.ws.rs.QueryParam;
+import javax.ws.rs.core.MediaType;
+import javax.ws.rs.core.Response;
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+import java.util.concurrent.ConcurrentMap;
+
+import static com.google.common.base.Preconditions.checkArgument;
+import static com.google.common.base.Preconditions.checkNotNull;
+import static javax.ws.rs.core.Response.Status.BAD_REQUEST;
+import static javax.ws.rs.core.Response.Status.CONFLICT;
+import static javax.ws.rs.core.Response.Status.CREATED;
+import static javax.ws.rs.core.Response.Status.NOT_FOUND;
 
 @Path("routers")
 public class RouterWebResource extends AbstractWebResource {
@@ -168,7 +165,7 @@
             RouterId routerId = RouterId.valueOf(id);
             Set<RouterId> routerIds = Sets.newHashSet(routerId);
             get(RouterService.class).removeRouters(routerIds);
-            return Response.status(NO_CONTENT).entity(DELETE_SUCCESS).build();
+            return Response.noContent().entity(DELETE_SUCCESS).build();
         } catch (Exception e) {
             return Response.status(BAD_REQUEST).entity(e.getMessage()).build();
         }
diff --git a/apps/vtn/vtnweb/src/main/java/org/onosproject/vtnweb/resources/SubnetWebResource.java b/apps/vtn/vtnweb/src/main/java/org/onosproject/vtnweb/resources/SubnetWebResource.java
index 5d1ccad..e77358d 100644
--- a/apps/vtn/vtnweb/src/main/java/org/onosproject/vtnweb/resources/SubnetWebResource.java
+++ b/apps/vtn/vtnweb/src/main/java/org/onosproject/vtnweb/resources/SubnetWebResource.java
@@ -158,7 +158,7 @@
             Set<SubnetId> subIds = new HashSet<>();
             subIds.add(subId);
             get(SubnetService.class).removeSubnets(subIds);
-            return Response.status(201).entity("SUCCESS").build();
+            return Response.noContent().entity("SUCCESS").build();
         } catch (Exception e) {
             return Response.status(INTERNAL_SERVER_ERROR).entity(e.toString())
                     .build();
diff --git a/apps/vtn/vtnweb/src/main/java/org/onosproject/vtnweb/resources/TenantNetworkWebResource.java b/apps/vtn/vtnweb/src/main/java/org/onosproject/vtnweb/resources/TenantNetworkWebResource.java
index f32b131..cf17985 100644
--- a/apps/vtn/vtnweb/src/main/java/org/onosproject/vtnweb/resources/TenantNetworkWebResource.java
+++ b/apps/vtn/vtnweb/src/main/java/org/onosproject/vtnweb/resources/TenantNetworkWebResource.java
@@ -15,18 +15,24 @@
  */
 package org.onosproject.vtnweb.resources;
 
-import static com.google.common.base.Preconditions.checkNotNull;
-import static com.google.common.base.Preconditions.checkArgument;
-import static javax.ws.rs.core.Response.Status.INTERNAL_SERVER_ERROR;
-import static javax.ws.rs.core.Response.Status.OK;
-import static javax.ws.rs.core.Response.Status.NOT_FOUND;
-
-import java.io.InputStream;
-import java.util.Collections;
-import java.util.HashSet;
-import java.util.Iterator;
-import java.util.Set;
-import java.util.concurrent.ConcurrentMap;
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.databind.node.ObjectNode;
+import com.google.common.collect.Maps;
+import org.onlab.util.ItemNotFoundException;
+import org.onosproject.rest.AbstractWebResource;
+import org.onosproject.vtnrsc.DefaultTenantNetwork;
+import org.onosproject.vtnrsc.PhysicalNetwork;
+import org.onosproject.vtnrsc.SegmentationId;
+import org.onosproject.vtnrsc.TenantId;
+import org.onosproject.vtnrsc.TenantNetwork;
+import org.onosproject.vtnrsc.TenantNetwork.State;
+import org.onosproject.vtnrsc.TenantNetwork.Type;
+import org.onosproject.vtnrsc.TenantNetworkId;
+import org.onosproject.vtnrsc.tenantnetwork.TenantNetworkService;
+import org.onosproject.vtnweb.web.TenantNetworkCodec;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 import javax.ws.rs.Consumes;
 import javax.ws.rs.DELETE;
@@ -39,26 +45,18 @@
 import javax.ws.rs.QueryParam;
 import javax.ws.rs.core.MediaType;
 import javax.ws.rs.core.Response;
+import java.io.InputStream;
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.Iterator;
+import java.util.Set;
+import java.util.concurrent.ConcurrentMap;
 
-import org.onlab.util.ItemNotFoundException;
-import org.onosproject.rest.AbstractWebResource;
-import org.onosproject.vtnrsc.DefaultTenantNetwork;
-import org.onosproject.vtnrsc.PhysicalNetwork;
-import org.onosproject.vtnrsc.SegmentationId;
-import org.onosproject.vtnrsc.TenantId;
-import org.onosproject.vtnrsc.TenantNetwork;
-import org.onosproject.vtnrsc.TenantNetworkId;
-import org.onosproject.vtnrsc.TenantNetwork.State;
-import org.onosproject.vtnrsc.TenantNetwork.Type;
-import org.onosproject.vtnrsc.tenantnetwork.TenantNetworkService;
-import org.onosproject.vtnweb.web.TenantNetworkCodec;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-
-import com.fasterxml.jackson.databind.JsonNode;
-import com.fasterxml.jackson.databind.ObjectMapper;
-import com.fasterxml.jackson.databind.node.ObjectNode;
-import com.google.common.collect.Maps;
+import static com.google.common.base.Preconditions.checkArgument;
+import static com.google.common.base.Preconditions.checkNotNull;
+import static javax.ws.rs.core.Response.Status.INTERNAL_SERVER_ERROR;
+import static javax.ws.rs.core.Response.Status.NOT_FOUND;
+import static javax.ws.rs.core.Response.Status.OK;
 
 /**
  * REST resource for interacting with the inventory of networks.
@@ -253,7 +251,7 @@
             return Response.status(INTERNAL_SERVER_ERROR)
                     .entity(NETWORK_ID_NOT_EXIST).build();
         }
-        return Response.status(OK).entity(issuccess.toString()).build();
+        return ok(issuccess.toString()).build();
     }
 
     /**
diff --git a/apps/vtn/vtnweb/src/main/java/org/onosproject/vtnweb/resources/VirtualPortWebResource.java b/apps/vtn/vtnweb/src/main/java/org/onosproject/vtnweb/resources/VirtualPortWebResource.java
index f99192c..a635c11 100644
--- a/apps/vtn/vtnweb/src/main/java/org/onosproject/vtnweb/resources/VirtualPortWebResource.java
+++ b/apps/vtn/vtnweb/src/main/java/org/onosproject/vtnweb/resources/VirtualPortWebResource.java
@@ -15,32 +15,11 @@
  */
 package org.onosproject.vtnweb.resources;
 
-import static com.google.common.base.Preconditions.checkArgument;
-import static com.google.common.base.Preconditions.checkNotNull;
-import static javax.ws.rs.core.Response.Status.INTERNAL_SERVER_ERROR;
-import static javax.ws.rs.core.Response.Status.OK;
-import static javax.ws.rs.core.Response.Status.NOT_FOUND;
-
-import java.io.InputStream;
-import java.util.Collection;
-import java.util.Collections;
-import java.util.HashMap;
-import java.util.HashSet;
-import java.util.Map;
-import java.util.Set;
-import java.util.concurrent.ConcurrentMap;
-
-import javax.ws.rs.Consumes;
-import javax.ws.rs.DELETE;
-import javax.ws.rs.GET;
-import javax.ws.rs.POST;
-import javax.ws.rs.PUT;
-import javax.ws.rs.Path;
-import javax.ws.rs.PathParam;
-import javax.ws.rs.Produces;
-import javax.ws.rs.core.MediaType;
-import javax.ws.rs.core.Response;
-
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.databind.node.ObjectNode;
+import com.google.common.collect.Maps;
+import com.google.common.collect.Sets;
 import org.onlab.packet.IpAddress;
 import org.onlab.packet.MacAddress;
 import org.onlab.util.ItemNotFoundException;
@@ -62,11 +41,30 @@
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-import com.fasterxml.jackson.databind.JsonNode;
-import com.fasterxml.jackson.databind.ObjectMapper;
-import com.fasterxml.jackson.databind.node.ObjectNode;
-import com.google.common.collect.Maps;
-import com.google.common.collect.Sets;
+import javax.ws.rs.Consumes;
+import javax.ws.rs.DELETE;
+import javax.ws.rs.GET;
+import javax.ws.rs.POST;
+import javax.ws.rs.PUT;
+import javax.ws.rs.Path;
+import javax.ws.rs.PathParam;
+import javax.ws.rs.Produces;
+import javax.ws.rs.core.MediaType;
+import javax.ws.rs.core.Response;
+import java.io.InputStream;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.Map;
+import java.util.Set;
+import java.util.concurrent.ConcurrentMap;
+
+import static com.google.common.base.Preconditions.checkArgument;
+import static com.google.common.base.Preconditions.checkNotNull;
+import static javax.ws.rs.core.Response.Status.INTERNAL_SERVER_ERROR;
+import static javax.ws.rs.core.Response.Status.NOT_FOUND;
+import static javax.ws.rs.core.Response.Status.OK;
 
 /**
  * REST resource for interacting with the inventory of infrastructure
@@ -146,7 +144,7 @@
                 return Response.status(INTERNAL_SERVER_ERROR)
                         .entity(VPORT_ID_NOT_EXIST).build();
             }
-            return Response.status(OK).entity(issuccess.toString()).build();
+            return ok(issuccess.toString()).build();
         } catch (Exception e) {
             log.error("Deletes VirtualPort failed because of exception {}",
                       e.toString());