Metadata
- Author: URL redirects
- Full Title:: [GA4] Set Up Cross-Domain Measurement
- Category:: 🗞️Articles
- Document Tags:: Google Analytics,
- URL:: https://support.google.com/analytics/answer/10071811?hl=en
- Finished date:: 2023-10-28
Highlights
Without cross-domain measurement, new cookies with new IDs are created for each domain a user visits. As a result, a single user visiting different root domains (e.g. www.example.com and www.anotherexample.com) on the same device will be identified separately (two users and two sessions instead of one user and one session). (View Highlight)
New highlights added 2023-11-03
With cross-domain measurement, the cookies retain the same IDs as they are passed from one domain to another via a URL parameter (
_gl) when the user navigates between domains through a link or a form. As a result, Analytics identifies just one user and one session. (View Highlight)
Check your tag (e.g. the Google tag on each of your HTML pages) for each domain that you want to include in your cross-domain measurement. The tag on each page must use the same tag ID (i.e., the same “G-” ID) from the same web data stream. (View Highlight)
If the destination page redirects or doesn’t support arbitrary query parameters, the parameter
_glmay end up being removed from the URL even if it was appended by Analytics in the previous page. (This usually happens too quickly to observe by eye.) To confirm if this is happening to your site, check the network requests made by the previous page using the Chrome Developer Tools. To fix this issue, configure your site to preserve the parameter_glin redirects. (View Highlight)