{"id":18701025,"date":"2025-10-30T09:46:08","date_gmt":"2025-10-30T09:46:08","guid":{"rendered":"https:\/\/wordpress.org\/support\/topic\/f4-post-tree-404-error-on-tree-json-file\/"},"modified":"2025-10-30T09:46:08","modified_gmt":"2025-10-30T09:46:08","slug":"f4-post-tree-404-error-on-tree-json-file","status":"publish","type":"topic","link":"https:\/\/wordpress.org\/support\/topic\/f4-post-tree-404-error-on-tree-json-file\/","title":{"rendered":"F4 Post Tree – 404 Error on tree.json File"},"content":{"rendered":"\n

Hello F4 Post Tree development team,<\/p>\n\n\n\n

Thank you for developing this excellent plugin. I’ve encountered an issue after activating F4 Post Tree v2.0.3 and would like to report it for your consideration.<\/p>\n\n\n\n

Bug Report: F4 Post Tree – 404 Error on tree.json File<\/p>\n\n\n\n

Problem Description:
After activating F4 Post Tree plugin (v2.0.3), the following console error occurs repeatedly in WordPress admin:<\/p>\n\n\n\n

GET http:\/\/[site-url]\/wp-content\/f4-tree\/tree.json?_=1761816521079 404 (Not Found)<\/p>\n\n\n\n

Root Cause Analysis:
The issue occurs because:<\/p>\n\n\n\n

    \n
  1. The tree.json file is not created when the plugin is first activated<\/li>\n\n\n\n
  2. The URL generation for F4_TREE_POLLING_FILE_URL has a bug in the code<\/li>\n<\/ol>\n\n\n\n

    Technical Details:
    File Location: \/modules\/Tree\/Hooks.php (lines 89-95)<\/p>\n\n\n\n

    Current problematic code:
    if(!defined(‘F4_TREE_POLLING_FILE_URL’)) {
    define(
    ‘F4_TREE_POLLING_FILE_URL’,
    str_replace(ABSPATH, ‘\/’, F4_TREE_POLLING_FILE_PATH)
    );
    }<\/p>\n\n\n\n

    Issues:<\/p>\n\n\n\n

      \n
    1. str_replace(ABSPATH, ‘\/’, F4_TREE_POLLING_FILE_PATH) generates incorrect URLs<\/li>\n\n\n\n
    2. No activation hook ensures the wp-content\/f4-tree\/ directory and tree.json file are created<\/li>\n<\/ol>\n\n\n\n

      Environment Information:<\/p>\n\n\n\n

        \n
      • WordPress Version: 6.8.3<\/li>\n\n\n\n
      • PHP Version: 8.3.21<\/li>\n\n\n\n
      • Server: Apache on Linux<\/li>\n\n\n\n
      • Plugin Version: F4 Post Tree 2.0.3<\/li>\n\n\n\n
      • Site Language: Japanese (ja)<\/li>\n\n\n\n
      • Environment: Production<\/li>\n\n\n\n
      • WordPress Path: Custom installation path (\/wp\/ subdirectory)<\/li>\n<\/ul>\n\n\n\n

        Suggested Fix:<\/p>\n\n\n\n

          \n
        1. Fix URL generation – Replace with proper wp-content URL mapping<\/li>\n\n\n\n
        2. Add activation hook – Ensure directory\/file creation on plugin activation<\/li>\n\n\n\n
        3. Add file existence check – Verify file exists during plugin initialization<\/li>\n<\/ol>\n\n\n\n

          Impact:<\/p>\n\n\n\n

            \n
          • Tree polling functionality fails completely<\/li>\n\n\n\n
          • JavaScript console errors<\/li>\n\n\n\n
          • Real-time tree updates don’t work<\/li>\n\n\n\n
          • Affects multi-user collaborative editing experience<\/li>\n<\/ul>\n\n\n\n

            Expected Behavior:
            The tree.json file should be automatically created in wp-content\/f4-tree\/ directory with proper URL accessibility for the polling mechanism to work correctly.<\/p>\n\n\n\n

            Thank you for your time and consideration. Please let me know if you need any additional information.<\/p>\n\n\n\n

            Best regards<\/p>\n","protected":false},"template":"","class_list":["post-18701025","topic","type-topic","status-publish","hentry"],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/wordpress.org\/support\/wp-json\/wp\/v2\/topic\/18701025","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/wordpress.org\/support\/wp-json\/wp\/v2\/topic"}],"about":[{"href":"https:\/\/wordpress.org\/support\/wp-json\/wp\/v2\/types\/topic"}],"version-history":[{"count":0,"href":"https:\/\/wordpress.org\/support\/wp-json\/wp\/v2\/topic\/18701025\/revisions"}],"wp:attachment":[{"href":"https:\/\/wordpress.org\/support\/wp-json\/wp\/v2\/media?parent=18701025"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}