URL is just one of many that leads to a hidden page. any ASCII encoding that isn’t supported, written in Windows-1252 encoding, will also send you there, e.g. /%e6 /%d7
going to a page with a broken URL will either generate one of two spanish Nescafé advertisements with broken characters, OR a very small chance of the aforementioned archived page with the flashing GIF. the
Nescafé
advert itself seems to be leftover from yahoo’s code, the text shows up on several yahoo/yahoo-hosted sites.
the flashing GIF page has an encrypted hexadecimal hash code, it translates to this
the tumblr GIF URL listed there leads to this image:
the flashing GIF has several QR codes inside of it. scanning them generates text