Skip to content
    Moz logo Menu open Menu close
    • Products
      • Moz Pro
      • Moz Pro Home
      • Moz Local
      • Moz Local Home
      • STAT
      • Moz API
      • Moz API Home
      • Compare SEO Products
      • Moz Data
    • Free SEO Tools
      • Domain Analysis
      • Keyword Explorer
      • Link Explorer
      • Competitive Research
      • MozBar
      • More Free SEO Tools
    • Learn SEO
      • Beginner's Guide to SEO
      • SEO Learning Center
      • Moz Academy
      • MozCon
      • Webinars, Whitepapers, & Guides
    • Blog
    • Why Moz
      • Digital Marketers
      • Agency Solutions
      • Enterprise Solutions
      • Small Business Solutions
      • The Moz Story
      • New Releases
    • Log in
    • Log out
    • Products
      • Moz Pro

        Your all-in-one suite of SEO essentials.

      • Moz Local

        Raise your local SEO visibility with complete local SEO management.

      • STAT

        SERP tracking and analytics for enterprise SEO experts.

      • Moz API

        Power your SEO with our index of over 44 trillion links.

      • Compare SEO Products

        See which Moz SEO solution best meets your business needs.

      • Moz Data

        Power your SEO strategy & AI models with custom data solutions.

      Let your reputation grow with Reviews AI
      Moz Local

      Let your reputation grow with Reviews AI

      Learn more
    • Free SEO Tools
      • Domain Analysis

        Get top competitive SEO metrics like DA, top pages and more.

      • Keyword Explorer

        Find traffic-driving keywords with our 1.25 billion+ keyword index.

      • Link Explorer

        Explore over 40 trillion links for powerful backlink data.

      • Competitive Research

        Uncover valuable insights on your organic search competitors.

      • MozBar

        See top SEO metrics for free as you browse the web.

      • More Free SEO Tools

        Explore all the free SEO tools Moz has to offer.

      NEW Keyword Suggestions by Topic
      Moz Pro

      NEW Keyword Suggestions by Topic

      Learn more
    • Learn SEO
      • Beginner's Guide to SEO

        The #1 most popular introduction to SEO, trusted by millions.

      • SEO Learning Center

        Broaden your knowledge with SEO resources for all skill levels.

      • On-Demand Webinars

        Learn modern SEO best practices from industry experts.

      • How-To Guides

        Step-by-step guides to search success from the authority on SEO.

      • Moz Academy

        Upskill and get certified with on-demand courses & certifications.

      • MozCon

        Save on Early Bird tickets and join us in London or New York City

      Unlock flexible pricing & new endpoints
      Moz API

      Unlock flexible pricing & new endpoints

      Find your plan
    • Blog
    • Why Moz
      • Digital Marketers

        Simplify SEO tasks to save time and grow your traffic.

      • Small Business Solutions

        Uncover insights to make smarter marketing decisions in less time.

      • Agency Solutions

        Earn & keep valuable clients with unparalleled data & insights.

      • Enterprise Solutions

        Gain a competitive edge in the ever-changing world of search.

      • The Moz Story

        Moz was the first & remains the most trusted SEO company.

      • New Releases

        Get the scoop on the latest and greatest from Moz.

      Surface actionable competitive intel
      New Feature

      Surface actionable competitive intel

      Learn More
    • Log in
      • Moz Pro
      • Moz Local
      • Moz Local Dashboard
      • Moz API
      • Moz API Dashboard
      • Moz Academy
    • Avatar
      • Moz Home
      • Notifications
      • Account & Billing
      • Manage Users
      • Community Profile
      • My Q&A
      • My Videos
      • Log Out

    The Moz Q&A Forum

    • Forum
    • Questions
    • Users
    • Ask the Community

    Welcome to the Q&A Forum

    Browse the forum for helpful insights and fresh discussions about all things SEO.

    1. Home
    2. SEO Tactics
    3. Technical SEO
    4. CGI Parameters: should we worry about duplicate content?

    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.

    CGI Parameters: should we worry about duplicate content?

    Technical SEO
    2
    7
    2750
    Loading More Posts
    • Oldest to Newest
    • Newest to Oldest
    • Most Votes
    Reply
    • Reply as question
    Log in to reply
    This topic has been deleted. Only users with question management privileges can see it.
    • jackson_lo
      jackson_lo last edited by

      Hi,

      My question is directed to CGI Parameters. I was able to dig up a bit of content on this but I want to make sure I understand the concept of CGI parameters and how they can affect indexing pages.

      Here are two pages:

      No CGI parameter appended to end of the URL:

      http://www.nytimes.com/2011/04/13/world/asia/13japan.html

      CGI parameter appended to the end of the URL:

      http://www.nytimes.com/2011/04/13/world/asia/13japan.html?pagewanted=2&ref=homepage&src=mv

      Questions:

      Can we safely say that CGI parameters = URL parameters that append to the end of a URL? Or are they different? And given that you have rel canonical implemented correctly on your pages, search engines will move ahead and index only the URL that is specified in that tag?

      Thanks in advance for giving your insights. Look forward to your response.

      Best regards,

      Jackson

      1 Reply Last reply Reply Quote 0
      • stevenmusumeche
        stevenmusumeche @jackson_lo last edited by

        Since it is a duplicate and meant for mobile devices, then yes, I would use a canonical tag or even noindex if you don't want it in the index anyway.  Either method would eliminate the duplicate content problem.

        1 Reply Last reply Reply Quote 0
        • jackson_lo
          jackson_lo @jackson_lo last edited by

          The page content is the exact same, the the layout is built for a mobile device. So in essence we don't know why it would be indexed, unless that happens for mobile browsing pages...

          So the solution is to put a rel-canonical tag on that trailing parameter page to prevent duplicate content.

          1 Reply Last reply Reply Quote 0
          • stevenmusumeche
            stevenmusumeche @jackson_lo last edited by

            Is the page with device=iphone&c=y different than example.html?  If not, you should make sure to add the canonical tag to it.  If it is different, then you shouldn't add it because it's not a duplicate.

            1 Reply Last reply Reply Quote 0
            • jackson_lo
              jackson_lo @stevenmusumeche last edited by

              Hi Steve,

              Another thing I came across... a page with trailing parameters like ?device=iphone&c=y is rendering a different set of code. So we have the original page with the content, and then we have www.example.html?device=iphone&c=y. The one with the trailing parameter doesn't have a canonical tag attached to it, but it's indexed in Google (when we search the www.example.html URL) it shows up as number two.

              Do you have any insights into this? Will this be a duplicate content issue?

              Thanks!

              Jackson

              stevenmusumeche jackson_lo 3 Replies Last reply Reply Quote 0
              • jackson_lo
                jackson_lo last edited by

                Thank you Steve for your response. I had come across Dr. Pete's post in the past but forgot about it. Nonetheless, the CGI parameter explanation and the use of canonical tags answers my question.

                Jackson

                1 Reply Last reply Reply Quote 1
                • stevenmusumeche
                  stevenmusumeche last edited by

                  Yes, you can say CGI parameters = URL parameters.  I don't think many people refer to them as CGI parameters anymore though.

                  To answer your question, yes, as long as you have rel canonical set up correctly, then the URL parameters won't hurt your indexing.

                  For example, if you have your rel canonical set to http://mysite.com/japan.html

                  Then, only that page will be indexed, even if there are various parameters such as

                  http://mysite.com/japan.html?source=something&whateva=somethingelse

                  Just MAKE SURE to setup rel canonical correctly because it can be bad if you don't.  Check out Dr. Pete's post about this: http://www.seomoz.org/blog/catastrophic-canonicalization

                  jackson_lo 1 Reply Last reply Reply Quote 1
                  • 1 / 1
                  • First post
                    Last post

                  Got a burning SEO question?

                  Subscribe to Moz Pro to gain full access to Q&A, answer questions, and ask your own.


                  Start my free trial


                  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.

                  • See all categories

                  Related Questions

                  • znotes

                    Duplicate Content Issues with Pagination

                    Hi Moz Community, We're an eCommerce site so we have a lot of pagination issues but we were able to fix them using the rel=next and rel=prev tags. However, our pages have an option to view 60 items or 180 items at a time. This is now causing duplicate content problems when for example page 2 of the 180 item view is the same as page 4 of the 60 item view. (URL examples below) Wondering if we should just add a canonical tag going to the the main view all page to every page in the paginated series to get ride of this issue. https://www.example.com/gifts/for-the-couple?view=all&n=180&p=2 https://www.example.com/gifts/for-the-couple?view=all&n=60&p=4 Thoughts, ideas or suggestions are welcome. Thanks

                    Technical SEO | | znotes
                    0
                  • AliMac26

                    Duplicate content and 404 errors

                    I apologize in advance, but I am an SEO novice and my understanding of code is very limited. Moz has issued a lot (several hundred) of duplicate content and 404 error flags on the ecommerce site my company takes care of. For the duplicate content, some of the pages it says are duplicates don't even seem similar to me. additionally, a lot of them are static pages we embed images of size charts that we use as popups on item pages. it says these issues are high priority but how bad is this? Is this just an issue because if a page has similar content the engine spider won't know which one to index? also, what is the best way to handle these urls bringing back 404 errors? I should probably have a developer look at these issues but I wanted to ask the extremely knowledgeable Moz community before I do 🙂

                    Technical SEO | | AliMac26
                    0
                  • Lina500

                    How does Google view duplicate photo content?

                    Now that we can search by image on Google and see every site that is using the same photo, I assume that Google is going to use this as a signal for ranking as well. Is that already happening? I ask because I have sold many photos over the years with first-use only rights, where I retain the copyright. So I have photos on my site that I own the copyright for that are on other sites (and were there first). I am not sure if I should make an effort to remove these photos from my site or if I can wait another couple years.

                    Technical SEO | | Lina500
                    0
                  • HiteshP

                    Duplicate content on job sites

                    Hi, I have a question regarding job boards. Many job advertisers will upload the same job description to multiple websites e.g. monster, gumtree, etc. This would therefore be viewed as duplicate content. What is the best way to handle this if we want to ensure our particular site ranks well? Thanks in advance for the help. H

                    Technical SEO | | HiteshP
                    0
                  • Jom

                    Duplicate Content and URL Capitalization

                    I have multiple URLs that SEOMoz is reporting as duplicate content.  The reason is that there are characters in the URL that may, or may not, be capitalized depending on user input. A couple examples are: www.househitz.com/Pennsylvania/Houses-for-sale www.househitz.com/Pennsylvania/houses-for-sale www.househitz.com/Pennsylvania/Houses-for-rent www.househitz.com/Pennsylvania/houses-for-rent There are currently thousands of instances of this on the site. Is this something I should spend effort to try and resolve (may not be minor effort), or should I just ignore it and move on?

                    Technical SEO | | Jom
                    0
                  • ericmccarty

                    How much to change to avoid duplicate content?

                    Working on a site for a dentist.  They have a long list of services that they want us to flesh out with text.  They provided a bullet list of services, we're trying to get 1 to 2 paragraphs of text for each. Obviously, we're not going to write this off the top of our heads.  We're pulling text from other sources and trying to rework. The question is, how much rephrasing do we have to do to avoid a duplicate content penalty?  Do we make sure there are changes per paragraph, sentence, or phrase? Thanks! Eric

                    Technical SEO | | ericmccarty
                    0
                  • vforvinnie

                    Block Quotes and Citations for duplicate content

                    I've been reading about the proper use for block quotes and citations lately, and wanted to see if I was interpreting it the right way.  This is what I read: http://www.pitstopmedia.com/sem/blockquote-cite-q-tags-seo So basically my question is, if I wanted to reference Amazon or another stores product reviews, could I use the block quote and citation tags around their content so it doesn't look like duplicate content?  I think it would be great for my visitors, but also to the source as I am giving them credit.  It would also be a good source to link to on my products pages, as I am not competing with the manufacturer for sales.  I could also do this for product information right from the manufacturer. I want to do this for a contact lens site.  I'd like to use Acuvue's reviews from their website, as well as some of their product descriptions.  Of course I have my own user reviews and content for each product on my website, but I think some official copy could do well. Would this be the best method?  Is this how Rottentomatoes.com does it?  On every movie page they have 2-3 sentences from 50 or so reviews, and not much unique content of their own. Cheers, Vinnie

                    Technical SEO | | vforvinnie
                    1
                  • CPLDistribution

                    Duplicate Content issue

                    I have been asked to review an old website to an identify opportunities for increasing search engine traffic. Whilst reviewing the site I came across a strange loop. On each page there is a link to printer friendly version: http://www.websitename.co.uk/index.php?pageid=7&printfriendly=yes That page also has a link to a printer friendly version http://www.websitename.co.uk/index.php?pageid=7&printfriendly=yes&printfriendly=yes and so on and so on....... Some of these pages are being included in Google's index. I appreciate that this can't be a good thing, however, I am not 100% sure as to the extent to which it is a bad thing and the priority that should be given to getting it sorted. Just wandering what views people have on the issues this may cause?

                    Technical SEO | | CPLDistribution
                    0

                  Get started with Moz Pro!

                  Unlock the power of advanced SEO tools and data-driven insights.

                  Start my free trial
                  Products
                  • Moz Pro
                  • Moz Local
                  • Moz API
                  • Moz Data
                  • STAT
                  • Product Updates
                  Moz Solutions
                  • SMB Solutions
                  • Agency Solutions
                  • Enterprise Solutions
                  • Digital Marketers
                  Free SEO Tools
                  • Domain Authority Checker
                  • Link Explorer
                  • Keyword Explorer
                  • Competitive Research
                  • Brand Authority Checker
                  • Local Citation Checker
                  • MozBar Extension
                  • MozCast
                  Resources
                  • Blog
                  • SEO Learning Center
                  • Help Hub
                  • Beginner's Guide to SEO
                  • How-to Guides
                  • Moz Academy
                  • API Docs
                  About Moz
                  • About
                  • Team
                  • Careers
                  • Contact
                  Why Moz
                  • Case Studies
                  • Testimonials
                  Get Involved
                  • Become an Affiliate
                  • MozCon
                  • Webinars
                  • Practical Marketer Series
                  • MozPod
                  Connect with us

                  Contact the Help team

                  Join our newsletter
                  Moz logo
                  © 2021 - 2025 SEOMoz, Inc., a Ziff Davis company. All rights reserved. Moz is a registered trademark of SEOMoz, Inc.
                  • Accessibility
                  • Terms of Use
                  • Privacy

                  Looks like your connection to Moz was lost, please wait while we try to reconnect.