Handle unexpected value in request

[sagarnayak]

If i have this route.

#[get("/hello/<name>/<age>/<cool>")]
fn hello(name: &str, age: u8, cool: bool) -> String {
	if cool {
		format!("You're a cool {} year old, {}!", age, name)
	} else {
		format!("{}, we need to talk about your coolness.", name)
	}
}

and I provide an age number which is a number out of range from u8 then how do I handle this and send a meaningful message to the user.

As of now, I am thinking to create another route that takes a string age and tries to find the error that the user has one and provide a message.

[SergioBenitez]

Use a Result<u8, &str> instead of the bare u8. It will be an Err(&str) with the original parameter if and when it failed
to parse as a u8. All of this is discussed in detail in the API docs for FromParam.