Use path helper instead of url helper

app/controllers/projects/boards_controller.rb

@@ -20,7 +20,7 @@ class Projects::BoardsController < Projects::ApplicationController
   private
   def assign_endpoint_vars
-    @boards_endpoint = project_boards_url(project)
+    @boards_endpoint = project_boards_path(project)
     @bulk_issues_path = bulk_update_project_issues_path(project)
     @namespace_path = project.namespace.full_path
     @labels_endpoint = project_labels_path(project)

app/helpers/boards_helper.rb

@@ -6,7 +6,7 @@ module BoardsHelper
   def board_data
     {
       boards_endpoint: @boards_endpoint,
-      lists_endpoint: board_lists_url(board),
+      lists_endpoint: board_lists_path(board),
       board_id: board.id,
       disabled: "#{!can?(current_user, :admin_list, current_board_parent)}",
       issue_link_base: build_issue_link_base,