title: '¿Por qué tengo que volver a hacer clic para confirmar que quiero suscribirme después de haber hecho clic en el enlace de confirmación que me enviasteis?'
This is why, after indicating you want to sign up, we sent you a confirmation email to the email address you provided. If you receive this email, it confirms not only that the email address is working, but also that you have access to it.
In other words, only after you click the link in the confirmation email can we know for cerntain that:
Another reason is that while we could make it so that clicking the link in your email would immeadiatly subcribe you, it would be in violation of internet standards. ____ En concreto, la definición del método GET __del protocolo HTTP__ que establece que:
Una solicitud GET __ es lo que ocurre cuando sigues un enlace. Merely following a link should not make any changes (like subscribing you to a newsletter).
For example, when you receive an email, your email client may _preload_ the links in it in the background. So that they are quicker to load should you click on them.
Obviamente, esta precarga no debe confirmar tu suscripción. Which is why you need to click a button to confirm. Because that will trigger a __POST request__ and those can make changes.