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.
Blocking Dynamic URLs with Robots.txt
-
Background:
My e-commerce site uses a lot of layered navigation and sorting links. While this is great for users, it ends up in a lot of URL variations of the same page being crawled by Google. For example, a standard category page:
...which uses a "Price" layered navigation sidebar to filter products based on price also produces the following URLs which link to the same page:
http://www.mysite.com/widgets.html?price=1%2C250
http://www.mysite.com/widgets.html?price=2%2C250
http://www.mysite.com/widgets.html?price=3%2C250
As there are literally thousands of these URL variations being indexed, so I'd like to use Robots.txt to disallow these variations.
Question:
-
Is this a wise thing to do? Or does Google take into account layered navigation links by default, and I don't need to worry.
-
To implement, I was going to do the following in Robots.txt:
User-agent: *
Disallow: /*?
Disallow: /*=
....which would prevent any dynamic URL with a '?" or '=' from being indexed. Is there a better way to do this, or is this a good solution?
Thank you!
-
-
If you are happy with any URLs with query strings not being indexed your robots.txt will work fine.
Do any or your URLs with question marks in them have links to them? If so you might want to be careful blocking google from indexing them. I would think you'd lose the benefits those links would pass to your site.
-
Tait,
Thanks for the answer. I think the canonical tag would be ideal, but in terms of implementation, it would require some substantial code modification to the site / PHP code as I have a lot of categories, and adding this manually to each one would be very time consuming.
Would preventing the spiders from indexing any URLs with a "?" or "&" (which would only be dynamic URLs variations) cause any problems? Or is this just not an ideal best practice?
Thanks!
-
I don't know if there's a good solution with robots.txt given your URL structure. However, you could use the rel=canonical link tag in the header to force google to treat many of your URLs the same way. This would help you avoid duplicate content penalties.
More on rel=canonical:
http://www.google.com/support/webmasters/bin/answer.py?answer=139394
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
-
Large robots.txt file
We're looking at potentially creating a robots.txt with 1450 lines in it. This will remove 100k+ pages from the crawl that are all old pages (I know, the ideal would be to delete/noindex but not viable unfortunately) Now the issue i'm thinking is that a large robots.txt will either stop the robots.txt from being followed or will slow our crawl rate down. Does anybody have any experience with a robots.txt of that size?
Intermediate & Advanced SEO | | ThomasHarvey0 -
If Robots.txt have blocked an Image (Image URL) but the other page which can be indexed has this image, how is the image treated?
Hi MOZers, This probably is a dumb question but I have a case where the robots.tags has an image url blocked but this image is used on a page (lets call it Page A) which can be indexed. If the image on Page A has an Alt tags, then how is this information digested by crawlers? A) would Google totally ignore the image and the ALT tags information? OR B) Google would consider the ALT tags information? I am asking this because all the images on the website are blocked by robots.txt at the moment but I would really like website crawlers to crawl the alt tags information. Chances are that I will ask the webmaster to allow indexing of images too but I would like to understand what's happening currently. Looking forward to all your responses 🙂 Malika
Intermediate & Advanced SEO | | Malika11 -
URL Rewriting Best Practices
Hey Moz! I’m getting ready to implement URL rewrites on my website to improve site structure/URL readability. More specifically I want to: Improve our website structure by removing redundant directories. Replace underscores with dashes and remove file extensions for our URLs. Please see my example below: Old structure: http://www.widgets.com/widgets/commercial-widgets/small_blue_widget.htm New structure: https://www.widgets.com/commercial-widgets/small-blue-widget I've read several URL rewriting guides online, all of which seem to provide similar but overall different methods to do this. I'm looking for what's considered best practices to implement these rewrites. From what I understand, the most common method is to implement rewrites in our .htaccess file using mod_rewrite (which will find the old URLs and rewrite them according to the rewrites I implement). One question I can't seem to find a definitive answer to is when I implement the rewrite to remove file extensions/replace underscores with dashes in our URLs, do the webpage file names need to be edited to the new format? From what I understand the webpage file names must remain the same for the rewrites in the .htaccess to work. However, our internal links (including canonical links) must be changed to the new URL format. Can anyone shed light on this? Also, I'm aware that implementing URL rewriting improperly could negatively affect our SERP rankings. If I redirect our old website directory structure to our new structure using this rewrite, are my bases covered in regards to having the proper 301 redirects in place to not affect our rankings negatively? Please offer any advice/reliable guides to handle this properly. Thanks in advance!
Intermediate & Advanced SEO | | TheDude0 -
"noindex, follow" or "robots.txt" for thin content pages
Does anyone have any testing evidence what is better to use for pages with thin content, yet important pages to keep on a website? I am referring to content shared across multiple websites (such as e-commerce, real estate etc). Imagine a website with 300 high quality pages indexed and 5,000 thin product type pages, which are pages that would not generate relevant search traffic. Question goes: Does the interlinking value achieved by "noindex, follow" outweigh the negative of Google having to crawl all those "noindex" pages? With robots.txt one has Google's crawling focus on just the important pages that are indexed and that may give ranking a boost. Any experiments with insight to this would be great. I do get the story about "make the pages unique", "get customer reviews and comments" etc....but the above question is the important question here.
Intermediate & Advanced SEO | | khi50 -
URL mapping for site migration
Hi all! I'm currently working on a migration for a large e-commerce site. The old one has around 2.5k urls, the new one 7.5k. I now need to sort out the redirects from one to the other. This is proving pretty tricky, as the URL structure has changed site wide. There doesn't seem to be any consistent rules either so using regex doesn't really work. By and large, the copy appears to be the same though. Does anybody know of a tool I can crawl the sites with that will export the crawled url and related copy into a spreadsheet? That way I can crawl both sites and compare the copy to match them up. Thanks!
Intermediate & Advanced SEO | | Blink-SEO0 -
301 Redirection and apostrophes in URLs
Hi I am experiencing trouble getting any redirects with apostrophes in the URLs to 301 redirect in order to eliminate 404 errors. I have tried replacing the instance of the apostrophe in the source URL field to %27 and variations of this but to no avail. The site is a wordpress site (the old URLS are legacies from the old Business Catalyst site) and I am using the redirection plug in. I have gone into some detail with a helpful soul here http://wordpress.org/support/topic/how-to-deal-with-apostrophes-in-source-url but unfortunately to no result. If anyone has any idea how to solve this puzzle I would be grateful for the help. Example: http://www.tesselaars.com/blog/Inside_Flowers/post/Online_Marketing_for_Florists_Part_1%E2%80%93_A_Website_You_Won%27t_Regret/
Intermediate & Advanced SEO | | Seamoose0 -
301 redirect with /? in URL
For a Wordpress site that has the ending / in the URL with a ? after it... how can you do a 301 redirect to strip off anything after the / For example how to take this URL domain.com/article-name/?utm_source=feedburner and 301 to this URL domain.com/article-name/ Thank you for the help
Intermediate & Advanced SEO | | COEDMediaGroup0 -
Blocking HTTP 1.0?
One of my clients believes someone is trying to hack their site. We are seeing the requests with a server protocol or HTTP 1.0 so they want to block 1.0 entirely. Will this cause any problems with search engines or regular, non-spamming visitors?
Intermediate & Advanced SEO | | BryanPhelps-BigLeapWeb0