My project is upgrading from Node 16.14.2 to 18.12.1.

On my local machine using Chrome, going to our homepage (on port 8000) using the "localhost" name works without issue (http://localhost:8000/).

In our Github workflow, we have:

name: CI
on: [push]
env:
  [...]
  NODE_VERSION: 18

jobs:
  [...]
  e2e-test:
    timeout-minutes: 20
    runs-on: ubuntu-latest

    steps:
      - run: echo $HOME
      - name: Check out the code
        uses: actions/checkout@v3

      - name: Use node ${{ env.NODE_VERSION }}
        uses: actions/setup-node@v3
        with:
          node-version: ${{ env.NODE_VERSION }}
          cache: 'yarn'

      - name: Cypress run
        uses: cypress-io/github-action@v4
        with:
          start: yarn develop
          browser: chrome
          wait-on: "http://localhost:8000/"
          wait-on-timeout: 300
          command-prefix: 'percy exec -- yarn'
      [...]

However, this wait-on ends up timing out, resulting in the error:

...
You can now view [website] in the browser.
⠀
  http://localhost:8000/
⠀
View GraphiQL, an in-browser IDE, to explore your site's data and schema
⠀
  http://localhost:8000/___graphql
⠀
...
success Building development bundle - 97.705s
success Writing page-data.json files to public directory - 0.791s - 257/257 324.90/s
http://localhost:8000/ timed out on retry 331 of 11, elapsed 330780ms, limit 330000ms
Error: connect ECONNREFUSED 127.0.0.1:8000

This was working on Node 16 but now breaks on Node 18.

Doing some digging, I came across this discussion in the Node repository, saying that starting with Node 17, the IPv4 address "127.0.0.1" would no longer be accepted by default.

But when I changed my Github config above to use wait-on: "http://[::1]:8000/" instead of localhost, the error went away.
This leads me to believe that wait-on is not being "smart" about localhost.

Please let me know if this is an issue on my side that I should change or if you agree this is something to be tackled on the Cypress side.