Hi All,

I’m new to K6 and javascript.
I need to get some ‘Amazon CloudWatch’ Metrics in my K6 performance test suite.
Followed the steps given in HTTP Authentication , but it doesn’t work.

Is there any other way to send AWS request using AWS Signature in K6

Hi, welcome

Which k6 version are you using? (Output of k6 version )

AFAIK that’s the only way to authenticate with v4 in k6.

When you say “it doesn’t work”, what exactly doesn’t work? What steps did you take, what errors did you receive, etc.? It’s difficult to help you without being able to reproduce the issue.

There’s an AWS request signing demo that @mstoykov did several months ago: k6 compatible awsv4 library · GitHub

It’s not very polished, but it shows how this can be done without any browserify or other costly alternatives.

Hi @imiric ,

Sorry for the late reply.
The error i was getting when using browserified version of aws4 was -

TypeError: Object has no member 'setPrototypeOf' at file
I’m using k6 version - v0.26.2
I have resolved the issue by referring to solution in - this issue
is there an example for using APIGW?

I am always encountering 403 Forbidden issue
const signed = aws4.sign(
        region: 'ap-southeast-1',
        service: 'execute-api',
        hostname: 'xxx',
        path: '/API/xxx',
        headers: {
            'x-apigw-api-id': 'xxx',
        accessKeyId: __ENV.AWS_ACCESSKEY,
        secretAccessKey: __ENV.AWS_SECRETKEY,
console.log(JSON.stringify(signed))
let res = http.post("https://" + signed.hostname + signed.path + "/xxx", JSON.stringify(bp01_t01_body), {
    headers: signed.headers
console.log(JSON.stringify(res))
              
I wish to share the good news with u. This sample code is working fine with the execute-api service. Hope it can get released as part of the k6 jslib soon.
However, this is some change to handle if no using serviceSubdomain with different target (or host) in the code signWithHeaders function
 xyngfei:
However, this is some change to handle if no using serviceSubdomain with different target (or host) in the code signWithHeaders function
I did not understand what you meant, but neither serviceSubdomain nor target are required parameters (as far as I remember, I haven’t had time to look at that code in some time)
              
look at the example below, and this is a kind of a dirty hack, still need a better way to handle it.
let obj = signWithHeaders("POST", "execute-api", "ap-southeast-1", "test.k6.io", "flip_coin.php", body, "", { 'x-api-id': x_api_id }, null)
look at the signWithHeaders keyword
function signWithHeaders(method, service, region = "", target = "", path = "", body = null, query = "", headers = {}, serviceSubdomain = null) {
    var options = { headers: headers, region: region }
    options = fillOptions(options);
    options.headers["X-Amz-Date"] = toTime(options.timestamp)
    // assume no pass any arg, service == execute-api
    if (serviceSubdomain === null) {
        serviceSubdomain = service
    // techdebt - issue with using concat the servicesubdomain
    // console.log("serviceSubdomain: " + serviceSubdomain) 
    // var host = serviceSubDomain.concat(".", options.region, ".amazonaws.com")
    var host = target
    // onsole.log("host: " + host)
    options.headers["Host"] = host
hope I can clear your doubts.