Moz Q&A is closed.
After more than 13 years, and tens of thousands of questions, Moz Q&A closed on 12th December 2024. Whilst we’re not completely removing the content - many posts will still be possible to view - we have locked both new posts and new replies. More details here.
Allow or Disallow First in Robots.txt
-
If I want to override a Disallow directive in robots.txt with an Allow command, do I have the Allow command before or after the Disallow command?
example:
Allow: /models/ford///page*
Disallow: /models////page
-
Just caught this a bit late and probably to late to add something but my two pence is test it in Webmaster Tools, via Crawl -> Robot.txt tester - if you've not used this before simply add the url you want to test and Google highlights the directive that allows or disallows it.
-
Thank you Cyrus, yes, I have tried your suggested robots.txt checker and despite it validates the file, it shows me a couple of warnings about the "unusual" use of wildcard. It is my understanding that I would probably need to discuss all this with Google folks directly.
Thank you for you answer... and, yes Keri, I know this is a old thread, but still useful today!
Thanks
-
Can't say with 100% confidence, but sounds like it might work. You could always upload it to a server and use a robots.txt checker to validate, although sometimes the validator tools may incorporate slight differences in edge cases like this that make them moot.
-
Just a quick note, this question is actually from spring of 2012.
-
What about something like:
allow: /directory/$
disallow: /directory/*
Where I want this to be indexed:
http://www.mysite.com/directory/
But not this:
http://www.mysite.com/directory/sub-directory/
Ideas?
-
I really appreciate all that effort you put in to ensure your method was correct. many thanks.
-
Interesting question - I've had this discussion a couple of times with different SEOs. Here's my best understanding: There are actually 2 different answers - one if you are talking about Google, and one for every other search engine.
For most search engines, the "Allow" should come first. This is because the first matching pattern always wins, for the reasons Geoff stated.
But Google is different. They state:
"At a group-member level, in particular for
allow
anddisallow
directives, the most specific rule based on the length of the [path] entry will trump the less specific (shorter) rule. The order of precedence for rules with wildcards is undefined."Robots.txt Specifications - Webmasters — Google Developers
So for Google, order is not important, only the specificity of the rule based on the length of the entry. But the order of precedence for rules with wildcards is undefined.
This last part is important, because your directives contain wildcards. If I'm reading this right, your particular directives:
Allow: /models/ford///page*
Disallow: /models////pageSo if it's "undefined" which directive will Google follow, if order isn't important? Fortunately, there's a simple way to find out.Google Webmaster allows you to test any robots.txt file. I created a dummy file based on your rules, In this case, your directives worked perfectly no matter what order I put them in.
| http://cyrusshepard.com/models/ford/test/test/pages | Allowed by line 2: Allow: /models/ford///page* | Allowed by line 2: Allow: /models/ford///page* |
| http://cyrusshepard.com/models/chevy/test/test/pages | Blocked by line 3: Disallow: /models////page | Blocked by line 3: Disallow: /models////page |So, to summarize:1. Always put Allow directives first, as most search engines follow the "first rule counts" rule.2. Google doesn't care about order, but rather the specificity based on the length of the entry.3. The order of precedence for rules with wildcards is undefined.4. When in doubt, check your robots.txt file in Google Webmaster tools.Hope this helps.(sorry for the very long answer which basically says you were right all along
-
I understand your concern. I am basing my answer based on the fact that if you don't have a robots.txt at all, Google will still crawl you, which means its an allow by default. So all that matters in my opinion is the disallow, but because you need an allow from the wildcard disallow, you could allow that and disallow next.
Honestly, I don't think it matters. If you think the way a bot would work, it's not like robots.txt 1 line is read, then the bot goes crawling and then comes back reads the next line and so on. Does that make sense ? It reads all the lines in the robots.txt and then follows the directives. But to be sure, you can do either of the scenarios and see for yourself. I am sure the results would be same either way.
-
The allow directives need to come before the disallow directives for the same directory/file paths. (I have never personally tested this although it makes logical sense to instruct a robot to access one particular path within a directory structure before it sees that it is blocked from crawling that directory).
For example:-
Allow: /profiles
Disallow: /s2/profiles/me
Allow: /s2/profiles
Allow: /s2/photos
Allow: /s2/static
Disallow: /s2
As per how Google have formatted their robots.txt.
-
Thanks. I want to make sure I get this right in a syntax universally understood by all engines. I have seen webmasters all over the place on this one with some saying that crawlers use a first matching rule and others that say that crawlers use a last matching rule. I am almost thinking to have the allow command twice - before and after, to cover all bases.
-
I don't think it matters, but I think I would disallow first, because by default everything is an Allow.
Got a burning SEO question?
Subscribe to Moz Pro to gain full access to Q&A, answer questions, and ask your own.
Browse Questions
Explore more categories
-
Moz Tools
Chat with the community about the Moz tools.
-
SEO Tactics
Discuss the SEO process with fellow marketers
-
Community
Discuss industry events, jobs, and news!
-
Digital Marketing
Chat about tactics outside of SEO
-
Research & Trends
Dive into research and trends in the search industry.
-
Support
Connect on product support and feature requests.
Related Questions
-
One robots.txt file for multiple sites?
I have 2 sites hosted with Blue Host and was told to put the robots.txt in the root folder and just use the one robots.txt for both sites. Is this right? It seems wrong. I want to block certain things on one site. Thanks for the help, Rena
Technical SEO | | renalynd270 -
Robots txt. in page with 301 redirect
We currently have a a series of help pages that we would like to disallow from our robots txt. The thing is that these help pages are located in our old website, which now has a 301 redirect to current site. Which is the proper way to go around? 1- Add the pages we want to disallow to the robots.txt of the new website? 2- Break the redirect momentarily and add the pages to the robots.txt of the old one? Thanks
Technical SEO | | Kilgray0 -
Staging & Development areas should be not indexable (i.e. no followed/no index in meta robots etc)
Hi I take it if theres a staging or development area on a subdomain for a site, who's content is hence usually duplicate then this should not be indexable i.e. (no-indexed & nofollowed in metarobots) ? In order to prevent dupe content probs as well as non project related people seeing work in progress or finding accidentally in search engine listings ? Also if theres no such info in meta robots is there any other way it may have been made non-indexable, or at least dupe content prob removed by canonicalising the page to the equivalent page on the live site ? In the case in question i am finding it listed in serps when i search for the staging/dev area url, so i presume this needs urgent attention ? Cheers Dan
Technical SEO | | Dan-Lawrence0 -
Is there any value in having a blank robots.txt file?
I've read an audit where the writer recommended creating and uploading a blank robots.txt file, there was no current file in place. Is there any merit in having a blank robots.txt file? What is the minimum you would include in a basic robots.txt file?
Technical SEO | | NicDale0 -
No indexing url including query string with Robots txt
Dear all, how can I block url/pages with query strings like page.html?dir=asc&order=name with robots txt? Thanks!
Technical SEO | | HMK-NL0 -
How to allow googlebot past paywall
Does anyone know of any ways or ideas to allow Google/Bing etc. to index your content, but have it behind a paywall for users?
Technical SEO | | MirandaP0 -
How do you disallow HTTPS?
I currently have a site (startuploans.org) that runs everything as http, recently we decided to start an online application to process loan apps. Now, for one certain section we configured ssl to work (https://www.startuploans.org/secure/). If I go to the HTTPS url for any of my other pages they show up...I was going to just 301 everything from https but because it is in a subdirectiory I can't... Also, canonical URL's won't work either because it's a totally different system and the pages are generated in an odd manor. It's really just 1 page that needs to be disallowed.. Is there any way to disallow all HTTPS requests from robots.txt while keeping all the HTTP requests working as normal?
Technical SEO | | WebsiteConsultants0 -
Robots.txt and canonical tag
In the SEOmoz post - http://www.seomoz.org/blog/robot-access-indexation-restriction-techniques-avoiding-conflicts, it's being said - If you have a robots.txt disallow in place for a page, the canonical tag will never be seen. Does it so happen that if a page is disallowed by robots.txt, spiders DO NOT read the html code ?
Technical SEO | | seoug_20050