Improve APPM application name validating API

components/application-mgt/org.wso2.carbon.device.application.mgt.publisher.api/src/main/java/org/wso2/carbon/device/application/mgt/publisher/api/services/ApplicationManagementPublisherAPI.java

@@ -53,7 +53,6 @@ import javax.validation.Valid;
 import javax.ws.rs.Consumes;
 import javax.ws.rs.DELETE;
 import javax.ws.rs.GET;
-import javax.ws.rs.HEAD;
 import javax.ws.rs.POST;
 import javax.ws.rs.PUT;
 import javax.ws.rs.Path;
@@ -716,10 +715,10 @@ public interface ApplicationManagementPublisherAPI {
             @Multipart(value = "screenshot3") Attachment screenshot3
     );
 
-    @HEAD
+    @GET
     @Path("/device-type/{deviceType}/app-name/{appName}")
     @ApiOperation(
-            httpMethod = "HEAD",
+            httpMethod = "GET",
             value = "Check the application existence",
             notes = "This API is responsible to check whether application exist or not for the given device type and "
                     + "application name.",
@@ -734,11 +733,10 @@ public interface ApplicationManagementPublisherAPI {
             value = {
                     @ApiResponse(
                             code = 200,
-                            message = "OK. \n Application exists."),
+                            message = "OK. \n Application doesn't exists."),
                     @ApiResponse(
-                            code = 404,
-                            message = "NOT FOUND. \n Could.t find an application for given device type and application "
-                                    + "name."),
+                            code = 409,
+                            message = "CONFLICT. \n Application exists"),
                     @ApiResponse(
                             code = 400,
                             message = "Bad Request. \n Found invalid device type with the request."),

components/application-mgt/org.wso2.carbon.device.application.mgt.publisher.api/src/main/java/org/wso2/carbon/device/application/mgt/publisher/api/services/impl/ApplicationManagementPublisherAPIImpl.java

@@ -59,7 +59,6 @@ import javax.validation.Valid;
 import javax.ws.rs.Consumes;
 import javax.ws.rs.DELETE;
 import javax.ws.rs.GET;
-import javax.ws.rs.HEAD;
 import javax.ws.rs.POST;
 import javax.ws.rs.PUT;
 import javax.ws.rs.Path;
@@ -386,7 +385,7 @@ public class ApplicationManagementPublisherAPIImpl implements ApplicationManagem
     }
 
     @Override
-    @HEAD
+    @GET
     @Path("/device-type/{deviceType}/app-name/{appName}")
     public Response isExistingApplication(
             @PathParam("deviceType") String deviceType,
@@ -394,9 +393,9 @@ public class ApplicationManagementPublisherAPIImpl implements ApplicationManagem
         try {
             ApplicationManager applicationManager = APIUtil.getApplicationManager();
             if (applicationManager.isExistingAppName(appName, deviceType)) {
-                return Response.status(Response.Status.OK).build();
+                return Response.status(Response.Status.CONFLICT).build();
             }
-            return Response.status(Response.Status.NOT_FOUND).build();
+            return Response.status(Response.Status.OK).build();
         } catch (BadRequestException e) {
             log.error("Found invalid device type to check application existence.", e);
             return Response.status(Response.Status.BAD_REQUEST).build();

components/ui-request-interceptor/io.entgra.ui.request.interceptor/src/main/java/io/entgra/ui/request/interceptor/InvokerHandler.java

@@ -254,7 +254,8 @@ public class InvokerHandler extends HttpServlet {
      */
     private String generateBackendRequestURL(HttpServletRequest req) {
         StringBuilder urlBuilder = new StringBuilder();
-        urlBuilder.append(apiEndpoint).append(HandlerConstants.API_COMMON_CONTEXT).append(req.getPathInfo());
+        urlBuilder.append(apiEndpoint).append(HandlerConstants.API_COMMON_CONTEXT)
+                .append(req.getPathInfo().replace(" ", "%20"));
         if (StringUtils.isNotEmpty(req.getQueryString())) {
             urlBuilder.append("?").append(req.getQueryString());
         }