How can I disallow this URL: http://www.example.com/assets/ico/favicon.png?

Would these lines in my robots.txt work?

User-agent: *
Disallow: /blah/assets*
Disallow: /blah/assets/ico/
  • 2
    Why do you have /blah in your robots.txt while the URL starts with /assets (and doesn’t contain "blah")? – unor Jul 20 '14 at 16:21

Both of those would work, but they would also block anything else in those directories. If you only want to block that specific URL, you could do:

Disallow: */blah/assets/ico/favicon.png

Do you have a Google Webmasters Account setup? If so they have a new robots.txt test page where you can see if a URL is blocked or not based on your robots file.

EDIT: My original answer had the below. This would block all URLs that end with favicon.png since it has the $ at the end, but it's pointless in this case since only one favicon.png file can be in that directory. https://support.google.com/webmasters/answer/6062596?hl=en&ref_topic=6061961

Disallow: */blah/assets/ico/favicon.png$
  • Since when has $ been allowed in robots.txt? Do you have a source for that? – DisgruntledGoat Jul 20 '14 at 12:51
  • support.google.com/webmasters/answer/…. To block any URLs that end in a specific way, use $. I guess it's technically not needed in this case since you can't have more than one favicon.png file in that directory. But it's certainly allowed in robots.txt. – user1795832 Jul 20 '14 at 14:03
  • @DisgruntledGoat I edited my original answer to say the $ is not needed in this case – user1795832 Jul 20 '14 at 14:10
  • 1
    Why do you have the * at the beginning of the Disallow path? For parsers following the original robots.txt specification, your Disallow line won’t block the favicon. – unor Jul 20 '14 at 16:19
  • @user well technically you could have favicon.png and favicon.pngx if such a file extension existed, so you would need the $ in that case. As noted in my answer below, I would steer clear of using non-standard extensions unless there is no other way to achieve the effect. – DisgruntledGoat Jul 20 '14 at 19:09

Firstly, you shouldn't block your favicon image unless you have a very good reason.

What exactly is the 'blah' supposed to represent in your example? If the URL is as you state in the question, you should just use:

Disallow: /assets/ico/favicon.png

That will prevent crawling of the specific image. To block the whole ico directory, use:

Disallow: /assets/ico/

In robots.txt, any path listed matches URLs starting only from the beginning, so the above matches anything beginning with /assets/ico/.

There is no such thing as a * wildcard for Disallow in the robots.txt standard. It is a non-standard extension that according to Wikipedia is only supported by Google.

  • 1
    The major search engines (at least Google, Bing, Yahoo, and Ask) support * as a wildcard in disallow in some way. developers.google.com/webmasters/control-crawl-index/docs/… – user1795832 Jul 20 '14 at 14:36
  • OK, but others such as Duck Duck Go don't appear to (they are at least as popular as Ask). Regardless, the * wildcard isn't necessary in this situation anyway. – DisgruntledGoat Jul 20 '14 at 19:05
  • Depends if this would apply to multiple directories of the same structure, but yes you are probably right. And Duck Duck Go is nowhere near as popular as Ask. – user1795832 Jul 20 '14 at 22:57
  • @user ok maybe you're right about DDG. I'm constantly hearing about it, but never anything about Ask, so it certainly seems more popular. – DisgruntledGoat Jul 21 '14 at 11:02

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