diff --git a/app/assets/javascripts/lib/utils/flash_queue.js b/app/assets/javascripts/lib/utils/flash_queue.js
deleted file mode 100644
index f77afddbae3..00000000000
--- a/app/assets/javascripts/lib/utils/flash_queue.js
+++ /dev/null
@@ -1,46 +0,0 @@
-import _ from 'underscore';
-import createFlash from '~/flash';
-import AccessorUtilities from '~/lib/utils/accessor';
-
-const FLASH_QUEUE_KEY = 'flash-key';
-
-export function popFlashMessage() {
-  const page = $('body').attr('data-page');
-  let savedFlashMessages;
-  let returnVal = false;
-
-  if (!page) {
-    return returnVal;
-  }
-
-  if (AccessorUtilities.isLocalStorageAccessSafe()) {
-    savedFlashMessages = JSON.parse(window.localStorage.getItem(FLASH_QUEUE_KEY));
-    const queuedMessage = _.findWhere(savedFlashMessages, { bodyData: page });
-    if (queuedMessage) {
-      const queuedMessageIndex = _.findIndex(savedFlashMessages, { bodyData: page });
-      createFlash(queuedMessage.message, queuedMessage.type);
-      savedFlashMessages.splice(queuedMessageIndex, 1);
-      window.localStorage.setItem(FLASH_QUEUE_KEY, JSON.stringify(savedFlashMessages));
-    }
-    returnVal = true;
-  }
-
-  return returnVal;
-}
-
-export function saveFlashMessage(bodyData, message, type) {
-  let savedFlashMessages;
-
-  if (AccessorUtilities.isLocalStorageAccessSafe()) {
-    savedFlashMessages = JSON.parse(window.localStorage.getItem(FLASH_QUEUE_KEY));
-    if (!savedFlashMessages) {
-      savedFlashMessages = [];
-    }
-    savedFlashMessages.push({
-      bodyData,
-      message,
-      type,
-    });
-    window.localStorage.setItem(FLASH_QUEUE_KEY, JSON.stringify(savedFlashMessages));
-  }
-}
diff --git a/app/assets/javascripts/main.js b/app/assets/javascripts/main.js
index f76e2ae47a0..659dc9eaa1f 100644
--- a/app/assets/javascripts/main.js
+++ b/app/assets/javascripts/main.js
@@ -33,7 +33,6 @@ import './milestone_select';
 import './projects_dropdown';
 import './render_gfm';
 import initBreadcrumbs from './breadcrumb';
-import { popFlashMessage } from './lib/utils/flash_queue';
 
 import initDispatcher from './dispatcher';
 
@@ -263,5 +262,4 @@ document.addEventListener('DOMContentLoaded', () => {
   }
 
   initDispatcher();
-  popFlashMessage();
 });
diff --git a/app/assets/javascripts/pages/milestones/shared/components/promote_milestone_modal.vue b/app/assets/javascripts/pages/milestones/shared/components/promote_milestone_modal.vue
index af85c3915df..22248418c41 100644
--- a/app/assets/javascripts/pages/milestones/shared/components/promote_milestone_modal.vue
+++ b/app/assets/javascripts/pages/milestones/shared/components/promote_milestone_modal.vue
@@ -1,10 +1,9 @@
 <script>
   import axios from '~/lib/utils/axios_utils';
   import createFlash from '~/flash';
-  import { saveFlashMessage } from '~/lib/utils/flash_queue';
   import GlModal from '~/vue_shared/components/gl_modal.vue';
-  import { redirectTo } from '~/lib/utils/url_utility';
   import { s__, sprintf } from '~/locale';
+  import { visitUrl } from '~/lib/utils/url_utility';
   import eventHub from '../event_hub';
 
   export default {
@@ -27,20 +26,17 @@
       },
       text() {
         return s__(`Milestones|Promoting this milestone will make it available for all projects inside the group.
-        Existing project milestones with the same name will be merged.
+        Existing project milestones with the same title will be merged.
         This action cannot be reversed.`);
       },
     },
     methods: {
       onSubmit() {
         eventHub.$emit('promoteMilestoneModal.requestStarted', this.url);
-        return axios.post(this.url)
+        return axios.post(this.url, { params: { format: 'json' } })
           .then((response) => {
             eventHub.$emit('promoteMilestoneModal.requestFinished', { milestoneUrl: this.url, successful: true });
-            const responseURL = new URL(response.request.responseURL);
-            const bodyData = responseURL.searchParams.get('body_data');
-            saveFlashMessage(bodyData, `${this.milestoneTitle} promoted to group milestone`, 'notice');
-            redirectTo(`${responseURL.protocol}//${responseURL.host}${responseURL.pathname}`);
+            visitUrl(response.data.url);
           })
           .catch((error) => {
             eventHub.$emit('promoteMilestoneModal.requestFinished', { milestoneUrl: this.url, successful: false });
diff --git a/app/assets/javascripts/pages/projects/labels/components/promote_label_modal.vue b/app/assets/javascripts/pages/projects/labels/components/promote_label_modal.vue
index a6388d886e2..54695dfeb99 100644
--- a/app/assets/javascripts/pages/projects/labels/components/promote_label_modal.vue
+++ b/app/assets/javascripts/pages/projects/labels/components/promote_label_modal.vue
@@ -1,10 +1,9 @@
 <script>
   import axios from '~/lib/utils/axios_utils';
-  import { saveFlashMessage } from '~/lib/utils/flash_queue';
   import createFlash from '~/flash';
   import GlModal from '~/vue_shared/components/gl_modal.vue';
-  import { redirectTo } from '~/lib/utils/url_utility';
   import { s__, sprintf } from '~/locale';
+  import { visitUrl } from '~/lib/utils/url_utility';
   import eventHub from '../event_hub';
 
   export default {
@@ -32,7 +31,7 @@
     computed: {
       text() {
         return s__(`Milestones|Promoting this label will make it available for all projects inside the group. 
-        Existing project labels with the same name will be merged. This action cannot be reversed.`);
+        Existing project labels with the same title will be merged. This action cannot be reversed.`);
       },
       title() {
         const label = `<span
@@ -48,13 +47,10 @@
     methods: {
       onSubmit() {
         eventHub.$emit('promoteLabelModal.requestStarted', this.url);
-        return axios.post(this.url)
+        return axios.post(this.url, { params: { format: 'json' } })
           .then((response) => {
             eventHub.$emit('promoteLabelModal.requestFinished', { labelUrl: this.url, successful: true });
-            const responseURL = new URL(response.request.responseURL);
-            const bodyData = responseURL.searchParams.get('body_data');
-            saveFlashMessage(bodyData, `${this.labelTitle} promoted to group label`, 'notice');
-            redirectTo(`${responseURL.protocol}//${responseURL.host}${responseURL.pathname}`);
+            visitUrl(response.data.url);
           })
           .catch((error) => {
             eventHub.$emit('promoteLabelModal.requestFinished', { labelUrl: this.url, successful: false });
diff --git a/app/controllers/projects/labels_controller.rb b/app/controllers/projects/labels_controller.rb
index a9fc890b28c..99790b8e7e8 100644
--- a/app/controllers/projects/labels_controller.rb
+++ b/app/controllers/projects/labels_controller.rb
@@ -1,6 +1,5 @@
 class Projects::LabelsController < Projects::ApplicationController
   include ToggleSubscriptionAction
-  include FlashHelper
 
   before_action :check_issuables_available!
   before_action :label, only: [:edit, :update, :destroy, :promote]
@@ -113,11 +112,14 @@ class Projects::LabelsController < Projects::ApplicationController
     begin
       return render_404 unless promote_service.execute(@label)
 
+      flash[:notice] = "#{@label.title} promoted to group label."
       respond_to do |format|
         format.html do
-          redirect_to(project_labels_path(@project, body_data: get_body_data_page(project_labels_path(@project))), status: 303)
+          redirect_to(project_labels_path(@project), status: 303)
+        end
+        format.json do
+          render json: { url: project_labels_path(@project) }
         end
-        format.js
       end
     rescue ActiveRecord::RecordInvalid => e
       Gitlab::AppLogger.error "Failed to promote label \"#{@label.title}\" to group label"
diff --git a/app/controllers/projects/milestones_controller.rb b/app/controllers/projects/milestones_controller.rb
index 9a4e99c39e9..ff93147d00f 100644
--- a/app/controllers/projects/milestones_controller.rb
+++ b/app/controllers/projects/milestones_controller.rb
@@ -1,6 +1,5 @@
 class Projects::MilestonesController < Projects::ApplicationController
   include MilestoneActions
-  include FlashHelper
 
   before_action :check_issuables_available!
   before_action :milestone, only: [:edit, :update, :destroy, :show, :merge_requests, :participants, :labels, :promote]
@@ -72,7 +71,16 @@ class Projects::MilestonesController < Projects::ApplicationController
 
   def promote
     Milestones::PromoteService.new(project, current_user).execute(milestone)
-    redirect_to project_milestones_path(project, body_data: get_body_data_page(project_milestones_path(project))), status: 303
+
+    flash[:notice] = "#{milestone.title} promoted to group milestone"
+    respond_to do |format|
+      format.html do
+        redirect_to project_milestones_path(project)
+      end
+      format.json do
+        render json: { url: project_milestones_path(project) }
+      end
+    end
   rescue Milestones::PromoteService::PromoteMilestoneError => error
     redirect_to milestone, alert: error.message
   end
diff --git a/app/helpers/flash_helper.rb b/app/helpers/flash_helper.rb
deleted file mode 100644
index 26572d4f206..00000000000
--- a/app/helpers/flash_helper.rb
+++ /dev/null
@@ -1,8 +0,0 @@
-module FlashHelper
-  def get_body_data_page(path)
-    return unless path.empty? == false
-
-    path_controller = Rails.application.routes.recognize_path(path)
-    [path_controller[:controller].split('/'), path_controller[:action]].compact.join(':')
-  end
-end
diff --git a/app/views/projects/milestones/show.html.haml b/app/views/projects/milestones/show.html.haml
index baf9dd465c0..b423888c875 100644
--- a/app/views/projects/milestones/show.html.haml
+++ b/app/views/projects/milestones/show.html.haml
@@ -32,7 +32,8 @@
             milestone_title: @milestone.title,
             url: promote_project_milestone_path(@milestone.project, @milestone),
             container: 'body' },
-            disabled: true }
+            disabled: true,
+            type: 'button' }
             = _('Promote')
           #promote-milestone-modal
 
diff --git a/app/views/shared/_label.html.haml b/app/views/shared/_label.html.haml
index b49be4a4376..5afbc78df53 100644
--- a/app/views/shared/_label.html.haml
+++ b/app/views/shared/_label.html.haml
@@ -48,15 +48,16 @@
 
   .pull-right.hidden-xs.hidden-sm
     - if label.is_a?(ProjectLabel) && label.project.group && can?(current_user, :admin_label, label.project.group)
-      %a.js-promote-project-label-button.btn.btn-transparent.btn-action.has-tooltip{ title: _('Promote to Group Label'),
+      %button.js-promote-project-label-button.btn.btn-transparent.btn-action.has-tooltip{ title: _('Promote to Group Label'),
+        disabled: true,
+        type: 'button',
         data: { url: promote_project_label_path(label.project, label),
                 label_title: label.title,
                 label_color: label.color,
                 label_text_color: label.text_color,
                 target: '#promote-label-modal',
                 container: 'body',
-                toggle: 'modal' },
-                disabled: true }
+                toggle: 'modal' } }
         = sprite_icon('level-up')
     - if can?(current_user, :admin_label, label)
       = link_to edit_label_path(label), title: "Edit", class: 'btn btn-transparent btn-action', data: {toggle: "tooltip"} do
diff --git a/app/views/shared/milestones/_milestone.html.haml b/app/views/shared/milestones/_milestone.html.haml
index 7a23f79d8c5..fe814cbc561 100644
--- a/app/views/shared/milestones/_milestone.html.haml
+++ b/app/views/shared/milestones/_milestone.html.haml
@@ -51,13 +51,14 @@
           \
 
           - if @project.group
-            %a.js-promote-project-milestone-button.btn.btn-xs.btn-grouped.has-tooltip{ title: _('Promote to Group Milestone'),
+            %button.js-promote-project-milestone-button.btn.btn-xs.btn-grouped.has-tooltip{ title: _('Promote to Group Milestone'),
+              disabled: true,
+              type: 'button',
               data: { url: promote_project_milestone_path(milestone.project, milestone),
                       milestone_title: milestone.title,
                       target: '#promote-milestone-modal',
                       container: 'body',
-                      toggle: 'modal' },
-                      disabled: true }
+                      toggle: 'modal' } }
               = _('Promote')
 
           = link_to 'Close Milestone', project_milestone_path(@project, milestone, milestone: {state_event: :close }), method: :put, remote: true, class: "btn btn-xs btn-close btn-grouped"
diff --git a/spec/controllers/projects/labels_controller_spec.rb b/spec/controllers/projects/labels_controller_spec.rb
index 0cba8486e79..452d7e23983 100644
--- a/spec/controllers/projects/labels_controller_spec.rb
+++ b/spec/controllers/projects/labels_controller_spec.rb
@@ -133,7 +133,7 @@ describe Projects::LabelsController do
       it 'gives access' do
         post :promote, namespace_id: project.namespace.to_param, project_id: project, id: label_1.to_param
 
-        expect(response.location).to include(namespace_project_labels_path)
+        expect(response).to redirect_to(namespace_project_labels_path)
       end
 
       it 'promotes the label' do
diff --git a/spec/controllers/projects/milestones_controller_spec.rb b/spec/controllers/projects/milestones_controller_spec.rb
index f44e77ab88d..306094f7ffb 100644
--- a/spec/controllers/projects/milestones_controller_spec.rb
+++ b/spec/controllers/projects/milestones_controller_spec.rb
@@ -98,7 +98,8 @@ describe Projects::MilestonesController do
       it 'shows group milestone' do
         post :promote, namespace_id: project.namespace.id, project_id: project.id, id: milestone.iid
 
-        expect(response.location).to include(project_milestones_path(project))
+        expect(flash[:notice]).to eq("#{milestone.title} promoted to group milestone")
+        expect(response).to redirect_to(project_milestones_path(project))
       end
     end
 
diff --git a/spec/javascripts/pages/labels/components/promote_label_modal_spec.js b/spec/javascripts/pages/labels/components/promote_label_modal_spec.js
index e68c957e135..ba2e07f02f7 100644
--- a/spec/javascripts/pages/labels/components/promote_label_modal_spec.js
+++ b/spec/javascripts/pages/labels/components/promote_label_modal_spec.js
@@ -2,7 +2,6 @@ import Vue from 'vue';
 import promoteLabelModal from '~/pages/projects/labels/components/promote_label_modal.vue';
 import eventHub from '~/pages/projects/labels/event_hub';
 import axios from '~/lib/utils/axios_utils';
-import * as urlUtility from '~/lib/utils/url_utility';
 import mountComponent from '../../../helpers/vue_mount_component_helper';
 
 describe('Promote label modal', () => {
@@ -59,11 +58,9 @@ describe('Promote label modal', () => {
           },
         });
       });
-      const redirectSpy = spyOn(urlUtility, 'redirectTo');
 
       vm.onSubmit()
         .then(() => {
-          expect(redirectSpy).toHaveBeenCalledWith(responseURL);
           expect(eventHub.$emit).toHaveBeenCalledWith('promoteLabelModal.requestFinished', { labelUrl: labelMockData.url, successful: true });
         })
         .then(done)
@@ -78,12 +75,10 @@ describe('Promote label modal', () => {
         expect(eventHub.$emit).toHaveBeenCalledWith('promoteLabelModal.requestStarted', labelMockData.url);
         return Promise.reject(dummyError);
       });
-      const redirectSpy = spyOn(urlUtility, 'redirectTo');
 
       vm.onSubmit()
         .catch((error) => {
           expect(error).toBe(dummyError);
-          expect(redirectSpy).not.toHaveBeenCalled();
           expect(eventHub.$emit).toHaveBeenCalledWith('promoteLabelModal.requestFinished', { labelUrl: labelMockData.url, successful: false });
         })
         .then(done)
diff --git a/spec/javascripts/pages/milestones/shared/components/promote_milestone_modal_spec.js b/spec/javascripts/pages/milestones/shared/components/promote_milestone_modal_spec.js
index d0ec4df7232..bf044fe8fb5 100644
--- a/spec/javascripts/pages/milestones/shared/components/promote_milestone_modal_spec.js
+++ b/spec/javascripts/pages/milestones/shared/components/promote_milestone_modal_spec.js
@@ -2,7 +2,6 @@ import Vue from 'vue';
 import promoteMilestoneModal from '~/pages/milestones/shared/components/promote_milestone_modal.vue';
 import eventHub from '~/pages/milestones/shared/event_hub';
 import axios from '~/lib/utils/axios_utils';
-import * as urlUtility from '~/lib/utils/url_utility';
 import mountComponent from '../../../../helpers/vue_mount_component_helper';
 
 describe('Promote milestone modal', () => {
@@ -54,11 +53,9 @@ describe('Promote milestone modal', () => {
           },
         });
       });
-      const redirectSpy = spyOn(urlUtility, 'redirectTo');
 
       vm.onSubmit()
         .then(() => {
-          expect(redirectSpy).toHaveBeenCalledWith(responseURL);
           expect(eventHub.$emit).toHaveBeenCalledWith('promoteMilestoneModal.requestFinished', { milestoneUrl: milestoneMockData.url, successful: true });
         })
         .then(done)
@@ -73,12 +70,10 @@ describe('Promote milestone modal', () => {
         expect(eventHub.$emit).toHaveBeenCalledWith('promoteMilestoneModal.requestStarted', milestoneMockData.url);
         return Promise.reject(dummyError);
       });
-      const redirectSpy = spyOn(urlUtility, 'redirectTo');
 
       vm.onSubmit()
         .catch((error) => {
           expect(error).toBe(dummyError);
-          expect(redirectSpy).not.toHaveBeenCalled();
           expect(eventHub.$emit).toHaveBeenCalledWith('promoteMilestoneModal.requestFinished', { milestoneUrl: milestoneMockData.url, successful: false });
         })
         .then(done)