1In axum a "handler" is an async function that accepts zero or more 2["extractors"](crate::extract) as arguments and returns something that 3can be converted [into a response](crate::response). 4 5Handlers are where your application logic lives and axum applications are built 6by routing between handlers. 7 8[`debug_handler`]: https://docs.rs/axum-macros/latest/axum_macros/attr.debug_handler.html 9