Struct HeaderCarrier 

pub struct HeaderCarrier { /* private fields */ }

A carrier for injecting and extracting trace context from HTTP headers.

Implementations

impl HeaderCarrier

pub fn new() -> Self

Creates a new empty header carrier.

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

Creates a header carrier from existing headers.

pub fn headers(&self) -> &HashMap<String, String>

Gets all headers.

pub fn into_headers(self) -> HashMap<String, String>

Consumes the carrier and returns the headers.

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

Gets a header value by key.

pub fn set(&mut self, key: String, value: String)

Sets a header value.

Trait Implementations

impl Clone for HeaderCarrier

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 HeaderCarrier

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

Formats the value using the given formatter.

impl Default for HeaderCarrier

fn default() -> Self

Returns the “default value” for a type.

impl Extractor for HeaderCarrier

fn get(&self, key: &str) -> Option<&str>

Get a value from a key from the underlying data.

fn keys(&self) -> Vec<&str>

Collect all the keys from the underlying data.

impl Injector for HeaderCarrier

fn set(&mut self, key: &str, value: String)

Add a key and value to the underlying data.