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Transparent pixel response with Symfony, how to track email opening

If you have ever heard about ” transparent pixel ”, ” 1x1 blank pixel ”, ” tracking pixel ” or simply ” tracking image ” you probably know what we are going to talk about and can just skip to the implementation ! Introduction Transparent pixel image is a technique often used to track some user behavior (often visits or views to a certain online content) in scenarios where you can’t use javascript. One of the most common scenarios is probably email opening tracking. Can you put Google Analytics into an…