HTTP Request

The Request interface is part of the Fetch API and represents the request of fetch().

• Constructor
  • Parameters
• Properties
• Methods
• Example

Constructor

The Request() constructor creates a new Request instance.

let request = new Request(input, init);

Parameters

name	type	optional	description
resource	Request or USVString	false	The resource can either be a request object or a URL string.
init	RequestInit	true	The init object lets you set optional parameters to apply to the request.

The return type is a Request instance.

RequestInit

name	type	default	description
method	string	GET	The method of the request.
headers	Headers or { [key: string]: string }	none	Th Headers for the request.
body	Blob, BufferSource, FormData, URLSearchParams, USVString, or ReadableStream	none	The body of the request.
cache	string	none	The cache mode of the request.
credentials	string	same-origin	The credentials mode of the request.
integrity	string	none	The crypotographic hash of the request's body.
mode	string	cors	The request mode you want to use.
redirect	string	follow	The mode of how redirects are handled.
referrer	string	about:client	A USVString specifying no-referrer, client or a URL.

Properties

name	type	description
cache	string	The cache mode indicates how the (default, no-cache, etc) request should be cached by browser.
credentials	string	The credentials (omit, same-origin, etc) indicate whether user agent should send cookies in case of CORs of the request.
destination	RequestDestination	The string indicates the type of content being requested.
body	ReadableStream	The getter exposes a ReadableStream of the body contents.
bodyUsed	boolean	Indicates whether the body content is read.
url	USVString	The URL of the request.
headers	Headers	The headers associated with the request.
integrity	string	The crypotographic hash of the request's body.
method	string	The request's method (POST, GET, etc).
mode	string	Indicates the mode of the request (e.g. cors ).
redirect	string	The mode of how redirects are handled.
referrer	string	The referrer of the request.
referrerPolicy	string	The referrer policy of the request

All the above properties are read only.

Methods

name	description
arrayBuffer()	Reads the body stream to its completion and returns an ArrayBuffer object.
blob()	Reads the body stream to its completion and returns a Blob object.
formData()	Reads the body stream to its completion and returns a FormData object.
json()	Reads the body stream to its completion, parses it as JSON and returns a JavaScript object.
text()	Reads the body stream to its completion and returns a USVString object (text).
clone()	Clones the Request object.

Example

function handler(_req) {
  // Create a post request
  const request = new Request("https://post.deno.dev", {
    method: "POST",
    body: JSON.stringify({
      message: "Hello world!",
    }),
    headers: {
      "content-type": "application/json",
    },
  });

  console.log(request.method); // POST
  console.log(request.headers.get("content-type")); // application/json

  return fetch(request);
}

Deno.serve(handler);