Instead of displaying plain 403 Forbidden and 404 Not Found errors that leads to nowhere, ask user to login to Bookie or go back to his bookmarks page.
403 Forbidden
Title: Access denied
Subtitle: 403 Forbidden
Text: You have no permissions to access this page
Link1: Login to Bookie (if user is not logged in)
Link2: Continue to your Bookie (refers to bookmarks page of user, if user is logged in)
404 Not Found
Title: Page was not found
Subtitle: 404 Not Found
Text: You probably entered a malformed URL address, bla, bla, bla....
Link: Go back or Continue to your Bookie
Internal Server Error
Title: Page was not found
Subtitle: 404 Not Found
Text: You probably entered a malformed URL address or an outdated (does not exist anymore) bookie (redirect) bookmark
Link: Go back or Continue to your Bookie
Instead of displaying plain 403 Forbidden and 404 Not Found errors that leads to nowhere, ask user to login to Bookie or go back to his bookmarks page.
403 Forbidden
Title: Access denied
Subtitle: 403 Forbidden
Text: You have no permissions to access this page
Link1: Login to Bookie (if user is not logged in)
Link2: Continue to your Bookie (refers to bookmarks page of user, if user is logged in)
404 Not Found
Title: Page was not found
Subtitle: 404 Not Found
Text: You probably entered a malformed URL address, bla, bla, bla....
Link: Go back or Continue to your Bookie
Internal Server Error
Title: Page was not found
Subtitle: 404 Not Found
Text: You probably entered a malformed URL address or an outdated (does not exist anymore) bookie (redirect) bookmark
Link: Go back or Continue to your Bookie