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Params (k6/http)

Params is an object used by the http.* methods that generate HTTP requests. Params contains request-specific options like e.g. HTTP headers that should be inserted into the request.

Name Type Description
Params.auth string The authentication method used for the request. It currently supports digest, ntlm, and basic authentication methods.
Params.cookies object Object with key-value pairs representing request scoped cookies (they won't be added to VU cookie jar)
{cookies: { key: "val", key2: "val2" }}

You also have the option to say that a request scoped cookie should override a cookie in the VU cookie jar:
{cookies: { key: { value: "val", replace: true }}}
Params.headers object Object with key-value pairs representing custom HTTP headers the user would like to add to the request.
Params.jar object http.CookieJar object to override default VU cookie jar with. Cookies added to request will be sourced from this jar and cookies set by server will be added to this jar.
Params.redirects number The number of redirects to follow for this request. Overrides the global test option maxRedirects.
Params.tags object Key-value pairs where the keys are names of tags and the values are tag values. Response time metrics generated as a result of the request will have these tags added to them, allowing the user to filter out those results specifically, when looking at results data.
Params.timeout number Request timeout to use in milliseconds. Default timeout is 60000ms(60 seconds).
Params.compression string Sets whether the request body should be compressed. If set to gzip it will use gzip to compress the body and set the appropriate Content-Length and Content-Encoding headers.

Possible values: gzip, deflate, br, zstd, and any comma-separated combination of them (for stacked compression)
Params.responseType string ResponseType is used to specify how to treat the body of the response. The three options are:
- text: k6 will return it as a string. This might not be what you want in cases of binary data as the conversation to UTF-16 will probably break it. This is also the default if
discardResponseBodies is set to false or not set at all.
- binary: k6 will return an array of ints/bytes
- none: k6 will return null as the body. The whole body will be ignored. This is the default when discardResponseBodies is set to true.

Example of custom HTTP headers and tags

A k6 script that will make an HTTP request with a custom HTTP header and tag results data with a specific tag

import http from 'k6/http';

export default function() {
  let params = {
    cookies: { my_cookie: 'value' },
    headers: { 'X-MyHeader': 'k6test' },
    redirects: 5,
    tags: { k6test: 'yes' },
  let res = http.get('', params);

Example using http.batch() with Params

Here is another example using http.batch() with a Params argument:

import http from 'k6/http';

let url1 = '';
let url2 = '';
let apiToken =
let requestHeaders = {
  'User-Agent': 'k6',
  Authorization: 'Token ' + apiToken,

export default function() {
  let res = http.batch([
    { method: 'GET', url: url1, params: { headers: requestHeaders } },
    { method: 'GET', url: url2 },

Example of Digest Authentication

Here is one example of how to use the Params to Digest Authentication.

import http from 'k6/http';
import { check } from 'k6';

export default function() {
  // Passing username and password as part of URL plus the auth option will authenticate using HTTP Digest authentication
  let res = http.get(
    { auth: 'digest' },

  // Verify response
  check(res, {
    'status is 200': r => r.status === 200,
    'is authenticated': r => r.json().authenticated === true,
    'is correct user': r => r.json().user === 'user',
Example how to overwrite discardResponseBodies:

Example of overwrite discardResponseBodies

import http from 'k6/http';

export var options = { discardResponseBodies: true };
export default function() {}
export function setup() {
  // Get 10 random bytes in as an array of ints/bytes, without the responseType the body will be null
  const response = http.get('', {
    responseType: 'binary',
  // Print the array. Will look something like `176,61,15,66,233,98,223,196,43,1`