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This post knows where you're viewing it from (Lemmy doesn't proxy external images) [ARCHIVED]
(lemmy.ml)
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this post was submitted on 11 Aug 2023
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Privacy
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A place to discuss privacy and freedom in the digital world.
Privacy has become a very important issue in modern society, with companies and governments constantly abusing their power, more and more people are waking up to the importance of digital privacy.
In this community everyone is welcome to post links and discuss topics related to privacy.
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You can run Geolocation with images now? What the heck? How?
The image is generated on demand by a PHP script. It's not a static image file. Every time the web browser sends a GET /poc.png, a new image is generated based on the information your browser or app sends the server.
It's actually how a lot of tracking code works. The image data returned may be the same, but the data collection through cookies and maybe even some passive fingerprinting all happen every time you send a request.
It's not the image, it's a normal image. The server does the hard work when you make the request, and then it just builds the image accordingly.
Yeah I saw OPs explanation in the comments. That is fucking cool! And scary! I've never needed to generate images with code before, so Ive never even considered something like this before.