A Cloudflare-specific status code. Cloudflare established a TCP connection to the origin server, but the server didn't respond with an HTTP response before the connection timed out.
The Levi's 524 Too Superlow were ultra-low-rise women's jeans from the 2000s — sitting dangerously below the natural waist. A product of the Y2K era's war on waistbands. Mercifully discontinued.
Search on eBay ↗A timeout occurred — the server connected but then took too long to respond, like the 2000s taking too long to realize that ultra-low-rise jeans were a mistake. The 524 Too Superlow dropped the waistband so low it timed out trying to find the wearer's hips. Cloudflare connected to your server fine, but then your server just... sat there. Too low to function. Too slow to respond.