Enum FetchError 

#[non_exhaustive]
pub enum FetchError {
    Network(String),
    UnsupportedScheme(String),
    InvalidRequest(String),
    Blocked(String),
    NoProvider,
}

Why there is no response.

Note what is not here: an HTTP status. A server that answered is a FetchResponse whatever it answered with. These are the cases where nothing answered.

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.

Network(String)

The request could not be completed: DNS, TLS, connection, timeout, a malformed response, or a local read that failed.

One variant rather than a taxonomy because fetch() itself exposes one (TypeError), and a guest cannot act differently on a DNS failure than on a TLS one. The string is for a human reading a log.

UnsupportedScheme(String)

The URL’s scheme is not one this provider serves.

InvalidRequest(String)

The request was rejected before it was sent: an unparseable header, a method the provider will not issue.

Blocked(String)

Refused by policy rather than by the network. A provider that enforces an allowlist, or refuses to let an opaque origin reach the network, answers with this.

NoProvider

There is no provider installed. See DummyFetchProvider.

Trait Implementations

impl Clone for FetchError

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for FetchError

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

Formats the value using the given formatter.

impl Display for FetchError

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

Formats the value using the given formatter.

impl Eq for FetchError

impl Error for FetchError

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.

impl PartialEq for FetchError

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for FetchError