I have been searching for answers on Stack Exchange websites and I frequently see the answers providing links to other websites. This is in itself not a problem. The issue is that I also frequently run into links that are no longer functional. Sometimes the links go nowhere, sometimes the links go to some error page the destination website has pre-created. I was wondering if there was a way to alert users that one or more of the links they provided in their answer is no longer functional and requires attention. Is there already a standard procedure for this? If not, what procedure should I follow? I think giving the original author a chance to fix their answer is necessary before calling the answer invalid. What do other people do currently to address this issue? Is this Stack Exchange site specific or is there a global stack * protocol?
One such example is this question. The answer marked as "correct" has a dead link in it, and I flagged it. I was then alerted that the flag had been declined because "flags should only be used to make moderators aware of content that requires their intervention". What should non-authors do to address the situation?