Trait AsHeaderName 

pub trait AsHeaderName {
    // Required method
    fn as_lower(&self) -> Cow<'_, str>;
}

Trait for values that can be used as a lookup key against a HeaderMap.

Implementations exist for HeaderName and &HeaderName (zero-allocation, reusing the cached lowercase form), and for &str / String / &String (lowercased on the fly when needed).

Required Methods

fn as_lower(&self) -> Cow<'_, str>

Return the ASCII-lowercase form of this name. Borrows from the value when already lowercase, allocates otherwise.

Dyn Compatibility

This trait is dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementations on Foreign Types

impl AsHeaderName for &String

fn as_lower(&self) -> Cow<'_, str>

impl AsHeaderName for &str

fn as_lower(&self) -> Cow<'_, str>

impl AsHeaderName for String

fn as_lower(&self) -> Cow<'_, str>

impl AsHeaderName for str

fn as_lower(&self) -> Cow<'_, str>

Implementors

impl AsHeaderName for &HeaderName

impl AsHeaderName for HeaderName