An example of disengaging 404 error page..
It’s Yahoo! Okay, here’s the story..
Check https://siteexplorer.search.yahoo.com/.. is returning 404 HTTP response code.
Basically it is a customized 404 File Not Found page – so far so good.
However, to me, the page is lacking one of the basic requirements.. no link to any other website pages or a scope for navigation through site search option so that visitors don’t feel hapless. Simply, less useful to me!
I suppose, this Yahoo! page is not a new-born and has quite a few link references all over web. Google is showing many results (ref: https://www.google.co.in/search?q=link%3Asiteexplorer.search.yahoo.com&oq=link%3Asiteexplorer.search.yahoo.com).
Why Yahoo! is giving away user satisfaction? Is there any specific business logic or marketing goal.. curious to know. They’re not following their own way (ref: https://help.yahoo.com/kb/yahoo-web-hosting/learn-sln20331.html)!
These kind of dead-end pages are not very good for crawlers as well (ref: https://support.google.com/webmasters/answer/93641?hl=en).
Customized 404 error pages have become the rule. But not in expense of usability.. applicable for both users and spiders.
So, please customize correctly your 404 error page!