Unexpected EOF when proxy is used

Grafana k6 OSS Support
1

I’m getting and unexpected EOF error with a proxy enabled. Without the proxy the test runs successfully. Using curl I can confirm that my proxy settings are correct. Since the proxy certificates are self-signed, I use -k with curl and insecureSkipTLSVerify option in the test script.

k6 --version
k6 v1.4.2 (commit/5b725e8a6a, go1.25.4, linux/amd64)

Here is my test file:

import http from "k6/http";
import { sleep } from "k6";

export const options = {
    httpDebug: 'full',
    insecureSkipTLSVerify: true,
};


export default async function (context) {
    http.get('https://quickpizza.grafana.com');
    sleep(1);
}

Here is how I test my parameters. curl returns correct result

export HTTPS_PROXY=https://user:password@proxy.io:60000
curl -k https://quickpizza.grafana.com

But the k6 fails when the HTTPS_PROXY env is set:

k6 run ./scenarios/demo-proxy.js      

         /\      Grafana   /‾‾/  
    /\  /  \     |\  __   /  /   
   /  \/    \    | |/ /  /   ‾‾\ 
  /          \   |   (  |  (‾)  |
 / __________ \  |_|\_\  \_____/ 

     execution: local
        script: ./scenarios/demo-proxy.js
        output: -

     scenarios: (100.00%) 1 scenario, 1 max VUs, 10m30s max duration (incl. graceful stop):
              * default: 1 iterations for each of 1 VUs (maxDuration: 10m0s, gracefulStop: 30s)

INFO[0000] Request:
GET / HTTP/1.1
Host: quickpizza.grafana.com
User-Agent: Grafana k6/1.4.2
Accept-Encoding: gzip

  group= iter=0 request_id=19c53492-f47d-4809-9c0e-e75f0e8f6dcb scenario=default source=http-debug vu=1
WARN[0000] Request Failed                                error="Get \"https://quickpizza.grafana.com\": unexpected EOF"


  █ TOTAL RESULTS 

    HTTP
    http_req_duration....: avg=0s   min=0s   med=0s   max=0s   p(90)=0s   p(95)=0s  
    http_req_failed......: 100.00% 1 out of 1
    http_reqs............: 1       0.832024/s

    EXECUTION
    iteration_duration...: avg=1.2s min=1.2s med=1.2s max=1.2s p(90)=1.2s p(95)=1.2s
    iterations...........: 1       0.832024/s
    vus..................: 1       min=1      max=1
    vus_max..............: 1       min=1      max=1

    NETWORK
    data_received........: 3.7 kB  3.1 kB/s
    data_sent............: 1.8 kB  1.5 kB/s




running (00m01.2s), 0/1 VUs, 1 complete and 0 interrupted iterations
default ✓ [======================================] 1 VUs  00m01.2s/10m0s  1/1 iters, 1 per VU

I suspect the issue may be related to handling self‑signed certificates when using a proxy.

Is there a recommended way to fix or work around this issue when running k6 with a proxy and self‑signed certificates?