Headers

Polyfill for Headers, as specified in the Fetch Spec.

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Deprecated: see https://angular.io/guide/http

class Headers {
  static fromResponseHeaderString(headersString: string): Headers
  constructor(headers?: Headers | {...})
  append(name: string, value: string): void
  delete(name: string): void
  forEach(fn: (values: string[], name: string | undefined, headers: Map<string, string[]>) => void): void
  get(name: string): string | null
  has(name: string): boolean
  keys(): string[]
  set(name: string, value: string | string[]): void
  values(): string[][]
  toJSON(): {...}
  getAll(name: string): string[] | null
  entries()
}

Description

The only known difference between this Headers implementation and the spec is the lack of an entries method.

Static methods

fromResponseHeaderString()
Returns a new Headers instance from the given DOMString of Response Headers
static fromResponseHeaderString(headersString: string): Headers Parameters headersString Type: string. Returns Headers

Constructor

constructor(headers?: Headers | { [name: string]: any; } | null) Parameters headers Type: Headers | { [name: string]: any; } | null. Optional. Default is undefined.

Methods

append()
Appends a header to existing list of header values for a given header name.
append(name: string, value: string): void Parameters name Type: string. value Type: string. Returns void

delete()
Deletes all header values for the given name.
delete(name: string): void Parameters name Type: string. Returns void

forEach()
forEach(fn: (values: string[], name: string | undefined, headers: Map<string, string[]>) => void): void Parameters fn Type: (values: string[], name: string | undefined, headers: Map) => void. Returns void

get()
Returns first header that matches given name.
get(name: string): string | null Parameters name Type: string. Returns string | null

has()
Checks for existence of header by given name.
has(name: string): boolean Parameters name Type: string. Returns boolean

keys()
Returns the names of the headers
keys(): string[] Parameters There are no parameters. Returns string[]

set()
Sets or overrides header value for given name.
set(name: string, value: string | string[]): void Parameters name Type: string. value Type: string | string[]. Returns void

values()
Returns values of all headers.
values(): string[][] Parameters There are no parameters. Returns string[][]

toJSON()
Returns string of all headers.
toJSON(): { [name: string]: any; } Parameters There are no parameters. Returns `{ }`

getAll()
Returns list of header values for a given name.
getAll(name: string): string[] | null Parameters name Type: string. Returns string[] | null

entries()
This method is not implemented.
entries() Parameters There are no parameters.

Usage notes

Example

import {Headers} from '@angular/http';

var firstHeaders = new Headers();
firstHeaders.append('Content-Type', 'image/jpeg');
console.log(firstHeaders.get('Content-Type')) //'image/jpeg'

// Create headers from Plain Old JavaScript Object
var secondHeaders = new Headers({
  'X-My-Custom-Header': 'Angular'
});
console.log(secondHeaders.get('X-My-Custom-Header')); //'Angular'

var thirdHeaders = new Headers(secondHeaders);
console.log(thirdHeaders.get('X-My-Custom-Header')); //'Angular'