Enum Failure 

pub enum Failure {
    Unreachable(String),
    TimedOut(i64),
    BadResponse(String),
    Stopped,
}

Why no reply came back.

Three of these are the peer’s doing and one is the caller’s, which is the distinction worth keeping: a program that asked and did not get an answer has a failure to handle, and a program whose scope stopped wanting the answer has nothing to handle at all. A fifth that said “something went wrong” would be a Str with extra steps.

Variants

Unreachable(String)

Connect or write failed, or nothing is listening.

TimedOut(i64)

The exchange did not finish inside the deadline the implementation was given.

BadResponse(String)

Bytes arrived and were not an HTTP response.

Stopped

The caller stopped wanting the reply — Stop::asked became true while the exchange was in flight.

Not a failure of the request, and a caller that installed a Stop is expected to notice this before it renders anything: beck-eval turns it back into the cancellation it came from. crate::host::failure_value renders it as HttpUnreachable if one ever reaches a program, because HttpError is a published union and a fourth variant would be a wire change made for a case no program can observe.

Trait Implementations

impl Clone for Failure

fn clone(&self) -> Failure

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Failure

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl PartialEq for Failure

fn eq(&self, other: &Failure) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Eq for Failure

impl StructuralPartialEq for Failure