You can also rely on some messaging/queue system such as RabbitMq, Gearman or Beanstalkd. Lumbendil also pointed out that this solution is not the only one possible. Keep in mind that the kernel.terminate event is optional, and should only be called if your kernel implements TerminableInterface (it should work if you are using the Symfony Standard Edition). There’s only an apparent performance improvement for the web client who receives the response quicker and doesn’t care about the processing logic that will keep running on the server side.
#Pixel tools transparent code#
The code is not executed faster, but only in a different order. Obviously, from the point of view of the server, we are not “really” improving performance. This way the response is returned immediatly (before executing all the heavy logic) and the requesting client will not have to wait for processing. Notice that we have “wrapped” our potentially heavy logic within a callable function that gets executed when the kernel.terminate event is fired. */ class TransparentPixelResponse extends Response I will not cover these parts, but only the one related to the tracking flow explained before.įirst of all, we want to have a dedicated Response class to send back a transparent pixel to the client, let’s call it TransparentPixelResponse: Notice that you should have your own logic to generate emails, to store and send them.
#Pixel tools transparent how to#
Now let’s see how to implement this tracking flow using the Symfony framework. Anyway the image is trasparent and so small that the user will barely notice it. Then the image is sent back to the client that will render it on the screen. So the webserver generates on the fly the most small image possible: a 1x1 transparent image! The mail client is still waiting for an answer and it expects an image. Then it marks that email as opened in its own database for future reports. It checks the id parameter and uses it to determine which email has triggered the request.
It does not handle the request as a static image but it executes some logic. The request is handled by the webserver.
#Pixel tools transparent download#
When the user opens the email, his email client will start to download all the resources linked into the HTML code (usually images) and it will trigger a request to download the tracking image. Notice that it points to our server and has a parameter id=1234. Within the email content there’s a “smart” tracking image. The following image shows the typical tracking flow applied to emails:Ī user receives our HTML email. Can you put Google Analytics into an email? Well, probably it would not work as expected… So there’s something we can do? Of course there is, let’s jump into a concrete example. One of the most common scenarios is probably email opening tracking. 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. 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 J#php, #symfony, #http, #tracking, #email comments