In 2022, Google began changing the availability of the information available in User-Agent strings across their Chromium browsers. The change is to use the set of HTTP request header fields called Client Hints. Through this process, a server can request, and if approved by the client, receive information that would have been previously freely available in the User-Agent string. This change is likely to have an impact on publishers across the open web that may use User-Agent information today.
To explain what this change means, how it will impact the AdTech industry, and what you can do to prepare, we spoke with Nate West, our Director of Product.
What is the difference between User-Agents and Client Hints?
A User-Agent (UA) is a string, or line of text, that identifies information about a web server’s browser and operating system. For example, it can indicate if a device is on Safari on a Mac or Chrome on Windows.
Here is an example UA string from a Mac laptop running Chrome:
To limit the passive fingerprinting of users, Google is reducing components of the UA strings in their Chromium browsers and introducing Client Hints. When there is a trusted relationship between first-party domain owners and third-party servers, Client Hints can be used to share the same data.
This transition began in early 2022 with bigger expected changes beginning in February 2023. You can see in the above example, Chrome/109.0.0.0, where browser version information is already no longer available from the UA string on this desktop Chrome browser.
How can you use User-Agent device attributes today?
UA string information can be used for a variety of reasons. It is a component in web servers that has been available for decades. In the AdTech space, it can be used in various ad targeting use cases. It can be used by publishers to better understand their audience. The shift to limit access and information shared is to prevent nefarious usage of the data.
What are the benefits of Client Hints?
By using Client Hints, a domain owner, or publisher, can manage access to data activity that occurs on their web properties. Having that control may be advantageous. The format of the information shared is also cleaner than parsing a string from User-Agents. Although, given that Client Hints are not the norm across all browsers, a long-term solution may be needed to manage UA strings and Client Hints.
An advantage of capturing and sharing Client Hint information is to be prepared and understand if there is any impact to your systems and processes. This will help with the currently planned transition by Google, but also should the full UA string become further restricted.
Who will be impacted by this change?
Publishers across the open web should lean in to understand this change and any potential impact to them. The programmatic ecosystem supporting real-time bidding (RTB) needs to continue pushing for adoption of OpenRTB 2.6, which supports the passing of client hint information in place of data from UA strings.
What is Google’s timeline for implementing Client Hints?
Do businesses have to implement Client Hints? What happens if they don’t?
Not capturing and sharing with trusted partners can impact capabilities in place today. Given Chromium browsers account for a sizable portion of web traffic, the impact will vary for each publisher and tech company in the ecosystem. I would assess how UA strings are in use today, where you may have security concerns or not, and look to get more information on how to maintain data sharing with trusted partners.
We can help you adopt Client Hints
Reach out to our Customer Success team at tapadcustomersuccess@experian.com to explore the best options to handle the User-Agent changes and implement Client Hints. As leaders in the AdTech space, we’re here to help you successfully make this transition. Together we can review the options available to put you and your team on the best path forward.
About our expert
Nate West, Director of Product
Nate West joined Experian in 2022 as the Director of Product for our identity graph. Nate focuses on making sure our partners maintain and grow identity resolution solutions today in an ever-changing future state. He has over a decade of experience working for media organizations and AdTech platforms.
Latest posts
The home stretch for the holidays is nearing as second wind for retailers is just starting as Experian Marketing Services analyzes the post-Christmas retail trend. Christmas Day 2012 saw a 27% increase in online traffic to the top 500 retail sites compared to 2011. The top retail sites received more than 115.5 million total U.S. visits. To date the holiday online traffic for the past 7 weeks to retail sites are up 10% for 2012 vs. 2011. Each retail holiday milestone day saw online traffic increases so far this season. Amazon remained the top visited site among retailers for this past week ending Dec. 22, 2012 and was also the top visited site on Christmas Day. Walmart, Target, BestBuy and Macy’s round out the top 5 most visited sites. The chart below includes the top 10 results: As tablets dominated our weekly top product search lists all holiday season it wasn’t surprising to see that the Apple iTunes site visits increased 193% and Apple.com visits increased 155% on Christmas Day 2012 vs. Christmas Eve 2012. The top product search terms sending traffic to the Apple.com site were iPod Nano, iPad Mini and iPad 4. Amazon.com visits increased 24% on Christmas Day 2012 vs. Christmas Eve 2012 as the top product search terms sending traffic to their site were Amazon Kindle, Kindle Fire and Kindle Also seeing growth were gift card searches as the year-over-year total search volume for "gift card" variations increased 6.1% this year compared to 2011. The big spike in searches happened last week (as online shoppers passed shipping deadlines). Below are the top 10 gift card searches for last week. We will continue to publish retail site data and insights through this holiday season. Please leave us a comment below if you have any specific questions along the way. UPDATE: The top 500 retail sites received more than 129 million total US visits on Dec. 26th, an increase of 1% compared to 2011 and 12% compared to Christmas Day 2012. Amazon was the top site followed by Walmart, Target, BestBuy and Macy’s. JCPenney, QVC and The Home Depot all moved into the top 10 on the day after Christmas. Learn more about the author, Matt Tatham
Hi, Dana here with an update on my holiday shopping post from before Thanksgiving. Like I thought, I was able to get most of my shopping done that Black Friday weekend. It was all pretty fast and easy, but I did have one not so great experience too. My sister knew I was going to get something for my niece, so when she got an email from Toy World that everything would be 50% off on Black Friday she forwarded it to me to let me know. I was thrilled. I had done some searching for good toys this year and had some ideas. While I normally would shop online, the Toy World coupon said the 50% off was in-store only so I braved the crowds for a good deal. Unfortunately, when I got there I learned that the email was wrong – only select items were 50% off and others were buy one, get one 50% off. I was pretty upset because the hottest toys were the ones excluded from the deal. I came all that way based on the email. I wound up getting a gift, but I could have saved myself the hassle and long lines, especially since I didn’t get a deal that was different from any other day. That was a rough start to the shopping weekend, but, no worries, things improved. I have to tell you about my best shopping experience – I’ve been telling everyone! This year I used Pinterest to see what my mom has had her eye on lately. One of her pins is a food processor and I think that’s a perfect gift for her. I’m a card holder and reward member at Aaron’s department store and I know they carry some really nice kitchen appliances. They also happened to send me great Cyber Monday coupons in the mail – it was perfect timing. I went online on Cyber Monday, used the promo codes from the coupons and not only got great deals, but got free shipping too! How easy was that?! They also sent me shipping notifications so I knew exactly when to expect the package. I am really happy that I got something great for everyone on my list and now have time to enjoy the rest of 2012. I hope you enjoy it too! XOXO, Dana Editor’s note: You can tell that Aaron’s knows Dana. They used their direct mail piece to send her online offers because they know that’s her preferred purchase method. They’ve won her over once again and created a brand advocate. Learn where your company stands in your marketing efforts today, and how you can help move efforts forward to ensure your customers have good experiences like Dana had with Aaron’s, and avoid bad ones like her trip to Toy World.
With the busy holiday marketing season in full swing, Experian Marketing Services has released its online retail round-up for the week ending December 8. The online traffic to the top 500 retail sites increased 5% for the period of December 2 – 8, compared to the same week in 2011. Additionally, Amazon remained the top visited site among retailers, followed by Walmart and Target. The chart below includes the top 10 results: Experian Marketing Services also tracks top product searches. Listed below are the top 5 product searches for the week ending December 8: Uggs iPad mini iPad Beats by dre Ipod touch We will continue to publish weekly retail site data and insights through this holiday season. Please leave us a comment below if you have any specific questions along the way. Learn more about the author, Matt Tatham