Unfortunately some web servers return an error message or an incorrect response when asked about the status of a bookmark.
Linkman Pro is a link checker tool that can check bookmarks for dead links, intelligent (only major) content changes, and page movements.
The application reads this bookmark with the following method.
Auto Bookmark is an advanced plug-in for Adobe® Acrobat® and Adobe® Acrobat Professional® software.
The plug-in has special features for formatting bookmark titles and controlling their visual appearance.
Where known, the date of the last update to the bookmarked page is shown in the window.
Bookmarks that have been checked within the past hour are not re-checked.
PDF bookmarks provide a navigable table of contents and usually represent the chapters and sections in a document.
Bookmarks can link to various locations in an open PDF file or even another PDF file.