Struct hyper::header::HeaderName

pub struct HeaderName { /* fields omitted */ }

Represents an HTTP header field name

Header field names identify the header. Header sets may include multiple headers with the same name. The HTTP specification defines a number of standard headers, but HTTP messages may include non-standard header names as well as long as they adhere to the specification.

HeaderName is used as the HeaderMap key. Constants are available for all standard header names in the header module.

Representation

HeaderName represents standard header names using an enum, as such they will not require an allocation for storage. All custom header names are lower cased upon conversion to a HeaderName value. This avoids the overhead of dynamically doing lower case conversion during the hash code computation and the comparison operation.

Methods

impl HeaderName

pub fn from_bytes(src: &[u8]) -> Result<HeaderName, InvalidHeaderName>

Converts a slice of bytes to an HTTP header name.

This function normalizes the input.

pub fn from_lowercase(src: &[u8]) -> Result<HeaderName, InvalidHeaderName>

Converts a slice of bytes to an HTTP header name.

This function expects the input to only contain lowercase characters. This is useful when decoding HTTP/2.0 headers. The HTTP/2.0 specification requires that all headers be represented in lower case.

Examples

// Parsing a lower case header
let hdr = HeaderName::from_lowercase(b"content-length").unwrap();
assert_eq!(CONTENT_LENGTH, hdr);

// Parsing a header that contains uppercase characters
assert!(HeaderName::from_lowercase(b"Content-Length").is_err());

pub fn as_str(&self) -> &str

Returns a str representation of the header.

The returned string will always be lower case.

Trait Implementations

impl IntoHeaderName for HeaderName

impl<'a> IntoHeaderName for &'a HeaderName

impl FromStr for HeaderName

type Err = InvalidHeaderName

The associated error which can be returned from parsing.

fn from_str(s: &str) -> Result<HeaderName, InvalidHeaderName>

Parses a string s to return a value of this type.

impl AsHeaderName for HeaderName

impl<'a> AsHeaderName for &'a HeaderName

impl PartialEq<str> for HeaderName

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

Performs a case-insensitive comparison of the string against the header name

Examples

use http::header::CONTENT_LENGTH;

assert_eq!(CONTENT_LENGTH, "content-length");
assert_eq!(CONTENT_LENGTH, "Content-Length");
assert_ne!(CONTENT_LENGTH, "content length");

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

This method tests for !=.

impl PartialEq<HeaderName> for str

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

Performs a case-insensitive comparison of the string against the header name

Examples

use http::header::CONTENT_LENGTH;

assert_eq!(CONTENT_LENGTH, "content-length");
assert_eq!(CONTENT_LENGTH, "Content-Length");
assert_ne!(CONTENT_LENGTH, "content length");

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

This method tests for !=.

impl<'a> PartialEq<&'a HeaderName> for HeaderName

fn eq(&self, other: &&'a HeaderName) -> bool

This method tests for self and other values to be equal, and is used by ==.

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

This method tests for !=.

impl<'a> PartialEq<HeaderName> for &'a str

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

Performs a case-insensitive comparison of the string against the header name

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

This method tests for !=.

impl<'a> PartialEq<HeaderName> for &'a HeaderName

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

This method tests for self and other values to be equal, and is used by ==.

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

This method tests for !=.

impl PartialEq<HeaderName> for HeaderName

fn eq(&self, __arg_0: &HeaderName) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, __arg_0: &HeaderName) -> bool

This method tests for !=.

impl<'a> PartialEq<&'a str> for HeaderName

fn eq(&self, other: &&'a str) -> bool

Performs a case-insensitive comparison of the string against the header name

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

This method tests for !=.

impl Clone for HeaderName

fn clone(&self) -> HeaderName

Returns a copy of the value.

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

Performs copy-assignment from source.

impl AsRef<str> for HeaderName

fn as_ref(&self) -> &str

Performs the conversion.

impl AsRef<[u8]> for HeaderName

Important traits for &'a mut [u8]

impl<'a> Write for &'a mut [u8]impl<'a> Read for &'a [u8]

fn as_ref(&self) -> &[u8]

Performs the conversion.

impl Hash for HeaderName

fn hash<__H>(&self, __arg_0: &mut __H) where
    __H: Hasher, 

Feeds this value into the given [Hasher].

fn hash_slice<H>(data: &[Self], state: &mut H) where
    H: Hasher, 

Feeds a slice of this type into the given [Hasher].

impl Eq for HeaderName

impl Borrow<str> for HeaderName

fn borrow(&self) -> &str

Immutably borrows from an owned value.

impl<'a> HttpTryFrom<&'a str> for HeaderName

type Error = InvalidHeaderName

Associated error with the conversion this implementation represents.

fn try_from(
    s: &'a str
) -> Result<HeaderName, <HeaderName as HttpTryFrom<&'a str>>::Error>

impl HttpTryFrom<HeaderName> for HeaderName

type Error = Error

Associated error with the conversion this implementation represents.

fn try_from(
    t: HeaderName
) -> Result<HeaderName, <HeaderName as HttpTryFrom<HeaderName>>::Error>

impl<'a> HttpTryFrom<&'a [u8]> for HeaderName

type Error = InvalidHeaderName

Associated error with the conversion this implementation represents.

fn try_from(
    s: &'a [u8]
) -> Result<HeaderName, <HeaderName as HttpTryFrom<&'a [u8]>>::Error>

impl HttpTryFrom<Bytes> for HeaderName

type Error = InvalidHeaderNameBytes

Associated error with the conversion this implementation represents.

fn try_from(
    bytes: Bytes
) -> Result<HeaderName, <HeaderName as HttpTryFrom<Bytes>>::Error>

impl<'a> From<&'a HeaderName> for HeaderName

fn from(src: &'a HeaderName) -> HeaderName

Performs the conversion.

impl From<HeaderName> for Bytes

fn from(name: HeaderName) -> Bytes

Performs the conversion.

impl Debug for HeaderName

fn fmt(&self, fmt: &mut Formatter) -> Result<(), Error>

Formats the value using the given formatter.