Enum MetadataError 

pub enum MetadataError {
    InvalidKey(String),
    ReservedKey(String),
    AsciiKeyHasBinSuffix(String),
    BinaryKeyMissingBinSuffix(String),
    InvalidAsciiValue,
}

Why an insert into Metadata was rejected.

Variants

InvalidKey(String)

The key contained characters outside [0-9a-z_\-.].

ReservedKey(String)

The key is one the gRPC framework or HTTP transport owns.

AsciiKeyHasBinSuffix(String)

An ASCII insert was given a -bin key, which is reserved for binary values.

BinaryKeyMissingBinSuffix(String)

A binary insert was given a key that doesn’t end in -bin.

InvalidAsciiValue

An ASCII value contained bytes outside the printable range 0x20–0x7E.

Trait Implementations

impl Debug for MetadataError

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

Formats the value using the given formatter.

impl Display for MetadataError

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

Formats the value using the given formatter.

impl Error for MetadataError

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.