Can I custom the panic handling method?

[zemelLeong]

When the panic occoured. I want to use the panic message as response data. Is there any entrance to Rocket that can be handled uniformly.

fn main() {
    use std::any::Any;
    use std::ops::Deref;

    pub fn get_panic_message(panic: &Box<dyn Any + Send>) -> Option<&str> {
        panic
            .downcast_ref::<String>()
            .map(String::as_str)
            .or_else(|| panic.downcast_ref::<&'static str>().map(Deref::deref))
    }

    fn get_message() {
        use std::panic;

        let result = panic::catch_unwind(|| {
            let a: Option<i32> = None;
            let b = a.expect("Error message for response.");
            b
        });
        if result.is_err() {
            let err_result = result.expect_err("msg");
            let message = get_panic_message(&err_result);
            println!("{:?}=================", message);
        }
    }
    
    get_message();
}

[zemelLeong]

Forget it.

[the10thWiz]

Panicking is not normal, and should not be treated as such. As the error message notes, Panicking causes unwinding, which is an expensive operation. Your code should NEVER panic; if an error condition is recoverable you should return Option or Result, which provides full control over the error message provided.