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
-
No index tag robots.txt
Hi Mozzers, A client's website has a lot of internal directories defined as /node/*. I already added the rule 'Disallow: /node/*' to the robots.txt file to prevents bots from crawling these pages. However, the pages are already indexed and appear in the search results. In an article of Deepcrawl, they say you can simply add the rule 'Noindex: /node/*' to the robots.txt file, but other sources claim the only way is to add a noindex directive in the meta robots tag of every page. Can someone tell me which is the best way to prevent these pages from getting indexed? Small note: there are more than 100 pages. Thanks!
Technical SEO | | WeAreDigital_BE
Jens0 -
Google Webmaster Tools is saying "Sitemap contains urls which are blocked by robots.txt" after Https move...
Hi Everyone, I really don't see anything wrong with our robots.txt file after our https move that just happened, but Google says all URLs are blocked. The only change I know we need to make is changing the sitemap url to https. Anything you all see wrong with this robots.txt file? robots.txt This file is to prevent the crawling and indexing of certain parts of your site by web crawlers and spiders run by sites like Yahoo! and Google. By telling these "robots" where not to go on your site, you save bandwidth and server resources. This file will be ignored unless it is at the root of your host: Used: http://example.com/robots.txt Ignored: http://example.com/site/robots.txt For more information about the robots.txt standard, see: http://www.robotstxt.org/wc/robots.html For syntax checking, see: http://www.sxw.org.uk/computing/robots/check.html Website Sitemap Sitemap: http://www.bestpricenutrition.com/sitemap.xml Crawlers Setup User-agent: * Allowable Index Allow: /*?p=
Technical SEO | | vetofunk
Allow: /index.php/blog/
Allow: /catalog/seo_sitemap/category/ Directories Disallow: /404/
Disallow: /app/
Disallow: /cgi-bin/
Disallow: /downloader/
Disallow: /includes/
Disallow: /lib/
Disallow: /magento/
Disallow: /pkginfo/
Disallow: /report/
Disallow: /stats/
Disallow: /var/ Paths (clean URLs) Disallow: /index.php/
Disallow: /catalog/product_compare/
Disallow: /catalog/category/view/
Disallow: /catalog/product/view/
Disallow: /catalogsearch/
Disallow: /checkout/
Disallow: /control/
Disallow: /contacts/
Disallow: /customer/
Disallow: /customize/
Disallow: /newsletter/
Disallow: /poll/
Disallow: /review/
Disallow: /sendfriend/
Disallow: /tag/
Disallow: /wishlist/
Disallow: /aitmanufacturers/index/view/
Disallow: /blog/tag/
Disallow: /advancedreviews/abuse/reportajax/
Disallow: /advancedreviews/ajaxproduct/
Disallow: /advancedreviews/proscons/checkbyproscons/
Disallow: /catalog/product/gallery/
Disallow: /productquestions/index/ajaxform/ Files Disallow: /cron.php
Disallow: /cron.sh
Disallow: /error_log
Disallow: /install.php
Disallow: /LICENSE.html
Disallow: /LICENSE.txt
Disallow: /LICENSE_AFL.txt
Disallow: /STATUS.txt Paths (no clean URLs) Disallow: /.php$
Disallow: /?SID=
disallow: /?cat=
disallow: /?price=
disallow: /?flavor=
disallow: /?dir=
disallow: /?mode=
disallow: /?list=
disallow: /?limit=5
disallow: /?limit=10
disallow: /?limit=15
disallow: /?limit=20
disallow: /*?limit=250 -
Robots.txt - "File does not appear to be valid"
Good afternoon Mozzers! I've got a weird problem with one of the sites I'm dealing with. For some reason, one of the developers changed the robots.txt file to disavow every site on the page - not a wise move! To rectify this, we uploaded the new robots.txt file to the domain's root as per Webmaster Tool's instructions. The live file is: User-agent: * (http://www.savistobathrooms.co.uk/robots.txt) I've submitted the new file in Webmaster Tools and it's pulling it through correctly in the editor. However, Webmaster Tools is not happy with it, for some reason. I've attached an image of the error. Does anyone have any ideas? I'm managing another site with the exact same robots.txt file and there are no issues. Cheers, Lewis FNcK2YQ
Technical SEO | | PeaSoupDigital0 -
Question about construction of our sitemap URL in robots.txt file
Hi all, This is a Webmaster/SEO question. This is the sitemap URL currently in our robots.txt file: http://www.ccisolutions.com/sitemap.xml As you can see it leads to a page with two URLs on it. Is this a problem? Wouldn't it be better to list both of those XML files as separate line items in the robots.txt file? Thanks! Dana
Technical SEO | | danatanseo0 -
How ro write a robots txt file to point to your site map
Good afternoon from still wet & humid wetherby UK... I want to write a robots text file that instruct the bots to index everything and give a specific location to the sitemap. The sitemap url is:http://business.leedscityregion.gov.uk/CMSPages/GoogleSiteMap.aspx Is this correct: User-agent: *
Technical SEO | | Nightwing
Disallow:
SITEMAP: http://business.leedscityregion.gov.uk/CMSPages/GoogleSiteMap.aspx Any insight welcome 🙂0 -
Blocked by meta-robots but there is no robots file
OK, I'm a little frustred here. I've waited a week for the next weekly index to take place after changing the privacy setting in a wordpress website so Google can index, but I still got the same problem. Blocked by meta-robots, no index, no follow. But I do not see a robot file anywhere and the privacy setting in this Wordpress site is set to allow search engines to index this site. Website is www.marketalert.ca What am I missing here? Why can't I index the rest of the website and is there a faster way to test this rather than wait another week just to find out it didn't work again?
Technical SEO | | Twinbytes0 -
Is it terrible to not have robots.txt ?
I was under the impression that you really should have a robots.txt page, and not having one is pretty bad. However, hubspot (which I'm not impressed with) does not have the capability of properly implementing one. Will this hurt the site?
Technical SEO | | StandUpCubicles1 -
Robots.txt File Redirects to Home Page
I've been doing some site analysis for a new SEO client and it has been brought to my attention that their robots.txt file redirects to their homepage. I was wondering: Is there a benfit to setup your robots.txt file to do this? Will this effect how their site will get indexed? Thanks for your response! Kyle Site URL: http://www.radisphere.net/
Technical SEO | | kchandler0