Struct hyper::header::HeaderName

[+] Show declaration

pub struct HeaderName { /* fields omitted */ }

[−] Expand description

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

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

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Converts a slice of bytes to an HTTP header name.

This function normalizes the input.

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

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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 from_static(src: &'static str) -> HeaderName

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Converts a static string to a HTTP header name.

This function panics when the static string is a invalid header.

This function requires the static string to only contain lowercase characters, numerals and symbols, as per the HTTP/2.0 specification and header names internal representation within this library.

Examples

// Parsing a standard header
let hdr = HeaderName::from_static("content-length");
assert_eq!(CONTENT_LENGTH, hdr);
 
// Parsing a custom header
let CUSTOM_HEADER: &'static str = "custom-header";
 
let a = HeaderName::from_lowercase(b"custom-header").unwrap();
let b = HeaderName::from_static(CUSTOM_HEADER);
assert_eq!(a, b);

// Parsing a header that contains invalid symbols(s):
HeaderName::from_static("content{}{}length"); // This line panics!
 
// Parsing a header that contains invalid uppercase characters.
let a = HeaderName::from_static("foobar");
let b = HeaderName::from_static("FOOBAR"); // This line panics!

pub fn as_str(&self) -> &str

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Returns a str representation of the header.

The returned string will always be lower case.

Trait Implementations

impl Clone for HeaderName

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fn clone(&self) -> HeaderName

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Returns a copy of the value.

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

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Performs copy-assignment from source.

impl Debug for HeaderName

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

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Formats the value using the given formatter.

impl FromStr for HeaderName

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type Err = InvalidHeaderName

The associated error which can be returned from parsing.

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

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

impl Borrow<str> for HeaderName

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fn borrow(&self) -> &str

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Immutably borrows from an owned value.

impl Eq for HeaderName

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

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

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type Error = Never

Associated error with the conversion this implementation represents.

fn try_from(     t: &'a HeaderName ) -> Result<HeaderName, <HeaderName as HttpTryFrom<&'a HeaderName>>::Error>

impl HttpTryFrom<HeaderName> for HeaderName

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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 str> for HeaderName

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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<Bytes> for HeaderName

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type Error = InvalidHeaderNameBytes

Associated error with the conversion this implementation represents.

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

impl HttpTryFrom<HeaderName> for HeaderValue

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type Error = InvalidHeaderValue

Associated error with the conversion this implementation represents.

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

impl Hash for HeaderName

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

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Feeds this value into the given [Hasher].

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

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

impl IntoHeaderName for HeaderName

impl<'a> IntoHeaderName for &'a HeaderName

impl AsRef<str> for HeaderName

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fn as_ref(&self) -> &str

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Performs the conversion.

impl AsRef<[u8]> for HeaderName

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Important traits for &'a mut [u8]

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

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

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Performs the conversion.

impl<'a> AsHeaderName for &'a HeaderName

impl AsHeaderName for HeaderName

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

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

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Performs the conversion.

impl From<HeaderName> for HeaderValue

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fn from(h: HeaderName) -> HeaderValue

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Performs the conversion.

impl From<HeaderName> for Bytes

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fn from(name: HeaderName) -> Bytes

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Performs the conversion.

impl Display for HeaderName

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

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Formats the value using the given formatter.

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

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

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

[+] Expand attributes #[must_use] fn ne(&self, other: &Rhs) -> bool

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This method tests for !=.

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

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

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

[+] Expand attributes #[must_use] fn ne(&self, other: &Rhs) -> bool

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This method tests for !=.

impl PartialEq<HeaderName> for str

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

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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");

[+] Expand attributes #[must_use] fn ne(&self, other: &Rhs) -> bool

[−]

This method tests for !=.

impl PartialEq<HeaderName> for HeaderName

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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: &HeaderName) -> bool

[−]

This method tests for !=.

impl PartialEq<str> for HeaderName

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

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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");

[+] Expand attributes #[must_use] fn ne(&self, other: &Rhs) -> 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

[+] Expand attributes #[must_use] 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 ==.

[+] Expand attributes #[must_use] fn ne(&self, other: &Rhs) -> bool

[−]

This method tests for !=.