Whether K6 supports TLS 1.3 ?

[hgkiller]

No description provided.

[na--]

It does, but not by default. Judging by the Go tls documentation, you need to set the GODEBUG environment variable to contain tls13=1. I tried executing the following script:

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

export default function () {
    let resp = http.get("https://www.howsmyssl.com/a/check");
    check(resp, {
        "status is 200": (resp) => resp.status === 200,
        "tls 1.3": (resp) => resp.json().tls_version === "TLS 1.3",
    });
};

with k6 v0.24.0 by running GODEBUG=tls13=1 k6 run zt.js and that worked, but only because of the environment variable... It seems like in Go 1.13 (the next Go version that would probably be released in August), there won't be any need to use the environment variable (golang/go#30055), but maybe we'll opt-in before that...

[na--]

Whether we wait for Go 1.13 or do the os.Setenv("GODEBUG", os.Getenv("GODEBUG")+",tls13=1") hack, we'd also need to edit this file: https://github.com/loadimpact/k6/blob/2a2fe2cc665e0d2b818c4f3ca7ce4fc9a5821294/lib/tlsconfig_go1_8.go#L30-L43

To add explicit support for tls 1.3 in the k6 options like this:

export let options = {
    tlsVersion: {
        max: "tls1.3",
    }
};

And somewhat connected issues that we probably should fix at the same time: #1055, #904