Missing GA4 traffic during migration, for example from UA

Missing Traffic When Migrating to Google Analytics 4 (GA4): Understanding and Solving CSP Blacklisting Issues


Migrating to Google Analytics 4 (GA4) is a crucial step for businesses to stay up-to-date with the latest analytics capabilities and make more informed decisions based on user data. GA4, as the next generation of analytics from Google, automatically utilizes your existing Universal Analytics data to offer a seamless transition. However, during migration, you may encounter an issue where some traffic seems to be missing from your GA4 reports. One of the primary reasons behind this can be Content Security Policy (CSP) blacklisting. In this blog, we will delve into what CSP blacklisting is, how it affects your Google Analytics data, and how to resolve this problem to ensure a smooth migration.

Understanding CSP Blacklisting

Content Security Policy (CSP) is an added layer of security that helps prevent cross-site scripting (XSS) attacks on web applications. It enables web developers to specify which sources of content are considered trusted and should be loaded and executed on their websites. CSP provides a way to restrict the types of resources that can be loaded, such as scripts, images, and other content, to mitigate security risks.

When CSP is enabled on your website, the browser follows the policy’s rules to determine whether to load and execute resources from specified domains. If a domain is not listed in the CSP configuration, the browser may refuse to connect to it, resulting in blacklisting.

Impact on GA4 Migration

During the process of migrating to GA4, your website might still be using the previous Universal Analytics tracking code or legacy scripts. GA4 automatically attempts to leverage this older data to ensure a smooth transition. However, due to CSP blacklisting, the data collected by Universal Analytics might not be transferred successfully to GA4. This leads to discrepancies in your GA4 reports, and certain traffic data may appear to be missing.

Identifying CSP Blacklisting

To identify if CSP blacklisting is causing the issue, follow these steps:

  1. Go to your website.
  2. Open the developer tools of your web browser (commonly accessed using the F12 key).
  3. Look for error messages indicating that the browser has refused to connect to specific domains related to GA4. The error message may resemble: “Refused to connect to https://region1.google-analytics.com.”

If you encounter such error messages, it is highly likely that CSP blacklisting is affecting the migration of data to GA4.

Resolving CSP Blacklisting for GA4

To ensure a successful migration and eliminate missing traffic in GA4, you need to adjust your Content Security Policy configuration. This can typically be done in your web server’s configuration file, such as .htaccess or nginx, or directly in your website’s source code.

Here’s an example of how to update your .htaccess file to resolve CSP blacklisting for GA4:

apacheconfCopy code<IfModule mod_headers.c> Header set Content-Security-Policy "script-src https://*.googletagmanager.com; img-src https://*.google-analytics.com https://*.googletagmanager.com; connect-src https://*.google-analytics.com https://*.analytics.google.com https://*.googletagmanager.com;" </IfModule>

This example adds the necessary domains for scripts, images, and connections related to GA4 to your CSP configuration.

For other web servers like nginx, you can adapt the same CSP configuration principles to the appropriate configuration syntax.

Privacy Friendly Alternatives

Now might be a time to consider switching to a privacy-friendly alternative for Google Analytics. There are many interesting alternatives available, like Visitor Analytics.

Final Thoughts

Migrating to Google Analytics 4 brings new opportunities for understanding user behavior and making data-driven decisions. However, missing traffic during the migration process can be frustrating. By identifying and resolving CSP blacklisting issues, you can ensure that your GA4 reports accurately reflect all relevant data. Always keep your web applications secure with the right Content Security Policy, striking a balance between enhanced security and seamless data migration.

Remember to test your website thoroughly after updating the CSP configuration to confirm that data is being collected correctly in GA4. Regularly monitoring your analytics reports and staying updated with best practices will help you make the most of GA4’s advanced capabilities while providing a better experience for your website visitors.

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