The server does not meet one of the preconditions specified by the client in the request headers. The If-Match or If-Unmodified-Since conditions were not satisfied.
The Levi's 412 Slim Shorts offer a modern slim fit through the hip and thigh, hitting above the knee. A trimmed-down take on classic denim — when regular shorts have too much fabric for your taste.
Find on Levi's ↗You set conditions, and the server couldn't meet them — just like trying to fit into slim shorts after the holidays. The 412 Slim Short has very specific preconditions about what size you need to be, and brother, you did not meet them. Your If-Modified-Since header was optimistic at best. Some preconditions are aspirational.