Posted on January 3, 10 Comments.
Discussion[ edit ] Checking if a link is really dead or not is a million dollar question because of soft s which are common. There is a technique for solving this problem described here and code here quote: Basically, you fetch the URL in question.
If that returns a hard then we know the host returns hard s on errors, and since the original page fetched okay, we know it must be good.
So then we need to test the contents of the two pages. If the content of the original URL is almost identical to the content of the known bad page, the original must be a dead page too. Otherwise, if the content of the original URL is different, it must be a good page.
That is a good point. We've discussed this and decided, for now, to not check for soft s. So for now, we're checking for: It's less than optimal, but at least we can be sure we don't end up tagging non-dead links as dead.
It turns out it's quite easy for a search engine or big web scrapers to detect soft s and various other kinds of dead links ones replaced by link farms etc. For this reason, we're seeking Internet Archive's help on this problem. Some other basic ways of detecting redirects is to look for these strings in the new path mix case: I've built up a database of around probable soft redirects and can see some repeating patterns across sites.
It's very basic filtering, but catches some more beyond root domain. I'll add those filters to the checker. Something could be down for a few days and then come back up for a while.
Also, can we clarify the goal here; is this to add archival links to unmarked links, or to tag unmarked links as dead which have no archival links, or to untag marked-as-dead links?
Since Cyberbot is processing a large wiki, the checks are naturally spaced out. That would give the link 3 or 9 days, in case it was temporarily down. Is it easy to trial this component as part of the bot's normal runtime?
Can you have it start maintaining its database now and after a week or two we can come back and check what un-tagged links it would have added archival links for or marked as dead? If it's on it will do both of those things.
I can create a special worker to run under a different bot account so we can monitor the edits more easily. Ignoring any 3-day limits. In other words, are you traversing through all articles in some order?
Following transclusions of some template? Due to technical complications, there is only one worker that traverses all of Wikipedia, and one that handles only articles with dead links.
So it would likely hit each URL much longer than 3 days, until the technical complication is resolved. Okay, let's try it.Pedestrians may not suddenly leave the curb and enter a crosswalk into the path of a moving vehicle that is so close to constitute an immediate hazard.
Pedestrians must yield the right-of-way to vehicles when crossing outside of a marked crosswalk or an unmarked crosswalk at an intersection.
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The path to labor organization was marked by false starts and wrong moves. Assess the validity of this generalization for the period – The First Great Awakening The Social Gospel Movement.
The path to truth has been filled with stumbling blocks seemingly insurmountable and many forks lead to false trails. Many who have started down the path have found the journey so difficult that they have turned back. Others, more determined and of stronger character have perished along the way.
Pedestrians may not suddenly leave the curb and enter a crosswalk into the path of a moving vehicle that is so close to constitute an immediate hazard. Pedestrians must yield the right-of-way to vehicles when crossing outside of a marked crosswalk or an unmarked crosswalk at an intersection.