Enum UpstreamError 

#[non_exhaustive]
pub enum UpstreamError {
    Exhausted,
    Transport(Error),
}

Why a live relay could not produce a response.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

Exhausted

The in-process scripted stub ran out of queued responses — a test drove more cache-miss relays than it scripted.

Transport(Error)

The live relay to the real provider failed at the transport level — the origin was unreachable, the connection dropped, or the response body could not be read.

Trait Implementations

impl Debug for UpstreamError

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

Formats the value using the given formatter.

impl Display for UpstreamError

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

Formats the value using the given formatter.

impl Error for UpstreamError

fn source(&self) -> Option<&(dyn Error + 'static)>

Returns the lower-level source of this error, if any.

fn description(&self) -> &str

👎Deprecated since 1.42.0:

use the Display impl or to_string()

fn cause(&self) -> Option<&dyn Error>

👎Deprecated since 1.33.0:

replaced by Error::source, which can support downcasting

fn provide<'a>(&'a self, request: &mut Request<'a>)

🔬This is a nightly-only experimental API. (error_generic_member_access)

Provides type-based access to context intended for error reports.