Struct HeadersCow 

pub struct HeadersCow<'a> { /* private fields */ }

Copy-on-write headers for deferred cloning.

Allows working with headers without cloning until mutation is needed.

Implementations

impl<'a> HeadersCow<'a>

pub fn borrowed(headers: &'a HashMap<String, Vec<String>>) -> Self

Create from a borrowed reference.

pub fn owned(headers: HashMap<String, Vec<String>>) -> Self

Create from an owned HashMap.

pub fn get(&self, name: &str) -> Option<&Vec<String>>

Get a header value by name.

pub fn get_first(&self, name: &str) -> Option<&str>

Get the first value for a header.

pub fn contains(&self, name: &str) -> bool

Check if a header exists.

pub fn set(&mut self, name: impl Into<String>, value: impl Into<String>)

Set a header value (triggers clone if borrowed).

pub fn add(&mut self, name: impl Into<String>, value: impl Into<String>)

Add a header value (triggers clone if borrowed).

pub fn remove(&mut self, name: &str) -> Option<Vec<String>>

Remove a header (triggers clone if borrowed).

pub fn is_owned(&self) -> bool

Check if the headers have been cloned.

pub fn into_owned(self) -> HashMap<String, Vec<String>>

Convert to owned HashMap.

pub fn len(&self) -> usize

Get the number of unique header names.

pub fn is_empty(&self) -> bool

Check if headers are empty.

pub fn iter(&self) -> impl Iterator<Item = (&str, &Vec<String>)>

Iterate over header names and values.

Trait Implementations

impl<'a> Clone for HeadersCow<'a>

fn clone(&self) -> HeadersCow<'a>

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<'a> Debug for HeadersCow<'a>

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

Formats the value using the given formatter.

impl Default for HeadersCow<'_>

fn default() -> Self

Returns the “default value” for a type.

impl<'a> From<&'a HashMap<String, Vec<String>>> for HeadersCow<'a>

fn from(headers: &'a HashMap<String, Vec<String>>) -> Self

Converts to this type from the input type.

impl From<HashMap<String, Vec<String>>> for HeadersCow<'_>

fn from(headers: HashMap<String, Vec<String>>) -> Self

Converts to this type from the input type.