wait-on perpetually returns ECONNREFUSED when using localhost, but works fine using 127.0.0.1

I had been using the [start-server-and-test](https://github.com/bahmutov/start-server-and-test) module for kicking off my server, and then starting my tests, however I couldn't get it to work using http. I ended up creating a minimal repro [here](https://github.com/thepuzzlemaster/playwright-defect-repro/tree/wait-on-defect) (note the wait-on-defect branch).

I realized that it *does* however, work fine if I switch my `localhost` to `127.0.0.1`. I can curl the localhost fine in a terminal window and it returns the html string. I'm using next js as my server, which does run via webpack, so using http-get, but to no avail.

repro steps:
- pull down minimal repro and checkout `wait-on-defect` branch
- `yarn install`
- `yarn test:integration`

Start with wait-on's HTTP resource handling and reproduce the report using the linked minimal repro on its wait-on-defect branch. Run yarn install followed by yarn test:integration, then verify that the requested localhost resource succeeds as it does with 127.0.0.1.

Written by the indexing model from the issue text.