Struct warp::reject::Rejection

Searches this Rejection for a specific cause.

A Rejection will accumulate causes over a Filter chain. This method can search through them and return the first cause of this type.

Example

use std::io;

let err = io::Error::new(
    io::ErrorKind::Other,
    "could be any std::error::Error"
);
let reject = warp::reject::custom(err);

if let Some(cause) = reject.find_cause::<io::Error>() {
   println!("found the io::Error: {}", cause);
}

Returns true if this Rejection was made via warp::reject::not_found.

Example

let rejection = warp::reject::not_found();

assert!(rejection.is_not_found());

Returns an optional error cause for this rejection.

If this Rejection is actuall a combination of rejections, then the returned cause is determined by an internal ranking system. If you’d rather handle different causes with different priorities, use find_cause.

Note

The return type will change from &Box<Error> to &Error in v0.2. This method isn’t marked deprecated, however, since most people aren’t actually using the Box part, and so a deprecation warning would just annoy people who didn’t need to make any changes.

Returns the argument unchanged.

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.