Привет Ян!

If using the devtools mobile emulation, you can add a custom device and there is a toggle to open the "User agent client hints" section where you can add header values: https://i.imgur.com/9vazymM.png. We should probably add sensible defaults to the mobile emulation options, I filed https://bugs.chromium.org/p/chromium/issues/detail?id=1293477 to track that work.

thanks,
Mike

On 2/2/22 2:41 PM, Ali Beyad wrote:
Hello:

On Wed, Feb 2, 2022 at 1:21 PM Ян Стахеев <[email protected]> wrote:

    Hi!
    I'm looking for a way to test Client Hints and to understand how
    CH will work on my site before UA will be reduced. For now I use
    #reduce-user-agent flag  disabling UA. Is blocking UA by the flag
    is enought to see the impact of UA reduction?


Yes, if you enable chrome://flags#reduce-user-agent, your browser will send the reduced UA string to all sites it visits.  Another option if you're a site developer is to participate in our UA reduction origin trial: https://developer.chrome.com/blog/user-agent-reduction-origin-trial/

    Also I can't fully model the situation in ChromeDev tools. When
    emulating the mobile version in ChromeDev tools, CH-UA are not
    displayed at all. Could you advise me, please, the reliable way I
    could test disabling the User-Agent and using CH on my site in
    order to understand that all ads, blocks, etc. will work correctly
    after disabling UA? Or just using the flag is pretty enought?


If you just want to test your site from your browser, enabling chrome://flags#reduce-user-agent and changing your site to send Accept-CH headers with the client hints you want should be enough.  If you want to test your site with others who visit it, you can participate in the origin trial linked to above.

Hope this helps!

    Thank you! :)
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