Menu

Important: This documentation is about an older version. It's relevant only to the release noted, many of the features and functions have been updated or replaced. Please view the current version.

Documentationbreadcrumb arrow Grafana k6breadcrumb arrow Using k6breadcrumb arrow HTTP debugging
Open source

HTTP debugging

Things don’t always work as expected. For those cases, enabling the –http-debug option will log HTTP requests and responses to help you debugging the script.

  • --http-debug logs the HTTP requests and responses, skipping the body.
  • --http-debug="full" logs the HTTP requests and responses, including the full body.

Example

Given the following script:

bash 
import http from "k6/http";

export default function() {
      http.get("https://google.com/");
}

If we run it using k6 run --http-debug script.js we get output that looks like this:

bash 
          /\      |‾‾|  /‾‾/  /‾/
     /\  /  \     |  |_/  /  / /
    /  \/    \    |      |  /  ‾‾\
   /          \   |  |‾\  \ | (_) |
  / __________ \  |__|  \__\ \___/ .io

   execution: local
      output: -
      script: script.js

    duration: -,  iterations: 1
         vus: 1, max: 1

Request: [----------------------------------------------------------] starting

GET / HTTP/1.1
Host: google.com
User-Agent: k6/0.20.0 (https://k6.io/);
Accept-Encoding: gzip


RedirectResponse:
HTTP/2.0 302 Found
Content-Length: 267
Alt-Svc: hq=":443"; ma=2592000; quic=51303432; quic=51303431; quic=51303339; quic=51303335,quic=":443"; ma=2592000; v="42,41,39,35"
Cache-Control: private
Content-Type: text/html; charset=UTF-8
Date: Thu, 22 Mar 2018 13:39:44 GMT
Location: https://www.google.se/?gfe_rd=cr&dcr=0&ei=ILKzWqiODOaxX_LBi5AG
Referrer-Policy: no-referrer


RedirectRequest:
GET /?gfe_rd=cr&dcr=0&ei=ILKzWqiODOaxX_LBi5AG HTTP/1.1
Host: www.google.se
User-Agent: k6/0.19.0 (https://k6.io/);
Referer: https://google.com/
Accept-Encoding: gzip


Response:
HTTP/2.0 200 OK
Connection: close
Accept-Ranges: none
Alt-Svc: hq=":443"; ma=2592000; quic=51303432; quic=51303431; quic=51303339; quic=51303335,quic=":443"; ma=2592000; v="42,41,39,35"
Cache-Control: private, max-age=0
Content-Type: text/html; charset=ISO-8859-1
Date: Thu, 22 Mar 2018 13:39:44 GMT
Expires: -1
P3p: CP="This is not a P3P policy! See g.co/p3phelp for more info."
Server: gws
Set-Cookie: 1P_JAR=2018-03-22-13; expires=Sat, 21-Apr-2018 13:39:44 GMT; path=/; domain=.google.se
Set-Cookie: NID=126=asTcm5s3-jMa1-pquG09m9lpUrowy-OtzZ9cUomBuKeJePbvwJAZe5wCtiyLITj9_RrlWLf6DTQ8ufpdB39MCRV-zUpfXAUw8XUVMWtgdU1gbtnQ9rssin56333g9Hyo; expires=Fri, 21-Sep-2018 13:39:44 GMT; path=/; domain=.google.se; HttpOnly
Vary: Accept-Encoding
X-Frame-Options: SAMEORIGIN
X-Xss-Protection: 1; mode=block

...

Read more