Invalid JSON error on builder-dot-lighthouse-ci

[osartun]

I'm currently implementing Lighthouse in our CI. However, it's a bit more complicated as we're deploying via Netlify and having a dynamically generated URL for each PR.
That's why I'm manually sending a POST request to https://lighthouse-ci.appspot.com/run_on_chrome

This works more or less fine. However, I just ran the first request from Travis and getting an error in the list of checks on the GitHub PR.

Error. invalid json response body at https://builder-dot-lighthouse-ci.appspot.com/ci reason: Unexpected token < in JSON at position 0

As I'm not making any requests to https://builder-dot-lighthouse-ci.appspot.com/ci I guess this is triggered by lighthouse-ci.appspot.com
That's why I think that there's something not working at your end

EDIT: The second time it ran successfully. So, it doesn't seem to be a general issue.

[ebidel]

Sometimes Lighthouse comes back with errors and the service doesn't do a good job of cleaning that up. Are you still seeing this?

How of curiosity, can you share the site you're testing so I can look through the logs?

[osartun]

The page I've been running the test on were PR deployments on Netlify: https://deploy-preview-26--publizist-frontend.netlify.com/meal-plan-app/

However, the tests only ran in the PR where I tested the Lighthouse integration and I ended up closing the PR without merging it because of a few other issues. So, we're not running any further tests with Lighthouse CI which is why I can't say whether these issues are still appearing or not.

[ebidel]

Looks like things are working again. I can't repro on that site. It's possible there was a server / network issue when you ran it the first time.

[bronz3beard]

Hi @ebidel
I have recently had the same or a similar issue running lh-bot, i was hoping you might be able to help me troubleshoot it.

This is the error:
(I have had the same error occur on 3 different PRs, and have not yet been able to get the bot to comment in the pr)
"Error from CI backend. invalid json response body at https://builder-dot-lighthouse-ci.appspot.com/ci reason: Unexpected token U in JSON at position 0"

This is the PR in staging: https://website-ssr-pr-14.herokuapp.com/

Travis yaml:
sudo: false
language: node_js
node_js:

• '10'
  install:
• node -v
  before_script:
• yarn
  cache:
  directories:
  • node_modules
    yarn: true
    git:
    depth: 3
    script:
  • yarn build
    after_success:
  • sleep 4m
  • yarn run lhbot https://website-ssr-pr-$TRAVIS_PULL_REQUEST.herokuapp.com/

Please let me know if you need any other information from me im really keen to get this working 😃