matomo-org/matomo

Tracking code generator incorrectly sets domains for websites that use www in the hostname

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#19,844 opened on Oct 11, 2022

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Description

When setting the URL for a website, we specify that it isn't necessary to specify URLs with and without www as Matomo handles both automatically. This means that people can set their URL to either www.example.org or to example.org: image

However, when the option "Track Visitors across all subdomains" is selected in the tracking code generator it incorrectly sets the domains and cookie domains to *.www.example.org when the website URL contains www: image

This can cause issues with the cookies on the websites tracked with things such as cookie consent tools that are quite strict and can cause issues with other things such as server-side tracking that relies on fetching the Visitor ID value from cookies

Contributor guide

Research direction
Inspect the tracking code generator logic to see how it constructs the domain and cookie domain when the website URL contains 'www'. Ensure that the domain is set to the root domain (e.g., '.example.org') instead of '*.www.example.org'.
Tech stack
php
Domain
backend
Issue type
Bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
PHPJavaScriptWeb Analytics
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
70