HTTP Status Cats is a legendary internet project that visualizes standard HTTP response codes using expressive cat photographs. Originally popularized by developer Tomomi Imura (Girliemac) in 2011, the series humanizes (or 'feline-izes') the often frustrating world of web debugging. Each cat is carefully selected to represent the mood of its corresponding error: a hidden cat for '404 Not Found,' a majestic cat for '200 OK,' or a stressed cat for '500 Internal Server Error.' This meme has become a cultural cornerstone for programmers and IT professionals, serving as a lighthearted way to communicate site issues and making technical documentation significantly more adorable.