Attempt HTTPS version of URL if HTTP redirect fails due to lack of CORS

Change-Id: I32f1bba6e7f1db17321665612a8ff2c2236446fb

appinventor/appengine/src/com/google/appinventor/client/wizards/TemplateUploadWizard.java

@@ -656,7 +656,7 @@ public class TemplateUploadWizard extends Wizard implements NewUrlDialogCallback
    * @param url A string of the form "http://... .asc
    * @param onSuccessCommand
    */
-  private static void openTemplateProject(String url, final NewProjectCommand onSuccessCommand) {
+  private static void openTemplateProject(final String url, final NewProjectCommand onSuccessCommand) {
     final Ode ode = Ode.getInstance();
 
     // This Async callback is called after the project is input and created
@@ -705,7 +705,11 @@ public class TemplateUploadWizard extends Wizard implements NewUrlDialogCallback
         public void onResponseReceived(Request request, Response response) {
           // The response.getText is the zip data used to create a new project.
           // The callback opens the project
-         ode.getProjectService().newProjectFromExternalTemplate(projectName,response.getText(),callback);
+          if (response != null && response.getStatusCode() == 200 && response.getText() != null && !response.getText().isEmpty()) {
+            ode.getProjectService().newProjectFromExternalTemplate(projectName, response.getText(), callback);
+          } else if (url.startsWith("http:")) {
+            openTemplateProject(url.replaceFirst("http:", "https:"), onSuccessCommand);
+          }
         }
       });
     } catch (RequestException e) {