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Editorial Team
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Asked: 2026-05-14T08:38:13+00:00

I have an ASP.NET website, but this question isn’t really about technology, it is

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I have an ASP.NET website, but this question isn’t really about technology, it is rather about practice. Should we log our 404 errors?

My reasoning:

  1. This is a potential vulnerable point because a simple unfriendly user may fill up your hard drive in no time just by requesting wrong URLs!
  2. Some browsers often request resources up front – like for example favicon.ico, even if its not there. This is really annoying.

But really I would like to know about a broken link if there exists one in my websites. Should I depend on the URL referrer? The problem with the URL referrer is that I cannot distinguish my internal redirect which may be broken with an unfriendly one from outside.

What does the practice suggest?

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  1. Editorial Team

    I would recommend logging unique URLs (one row per url, with a count field specifying how many times it was requested), and deleting the least-frequently requested ones if the log gets too large.

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