Repository: create-react-app
Issue: can't disable HTTPS with HOST set
Labels: needs triage,issue: bug report

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### Describe the bug

If I have the `HOST` env var set to a non-local domain like `.dev`, and `HTTPS=false`, it still redirects to HTTPS, and the browser throws an error. I'm trying to do this so I can test cookies that have sameSite rules set, and local domains/ips (e.g. `.local`) don't seem to play nice with cookies/don't work at all. Maybe there is a better way.

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Yes. Same issue persists.

### Which terms did you search for in User Guide?

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- "https"

### Environment

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```
  current version of create-react-app: 4.0.3
  running from /Users/jbaczuk/.npm/_npx/22848/lib/node_modules/create-react-app

  System:
    OS: macOS 11.2.3
    CPU: (8) x64 Apple M1
  Binaries:
    Node: 14.16.0 - ~/n/bin/node
    Yarn: 1.22.10 - ~/n/bin/yarn
    npm: 6.14.11 - ~/n/bin/npm
  Browsers:
    Chrome: 89.0.4389.128
    Edge: Not Found
    Firefox: 87.0
    Safari: 14.0.3
  npmPackages:
    react: ^17.0.2 => 17.0.2
    react-dom: ^17.0.2 => 17.0.2
    react-scripts: 4.0.3 => 4.0.3
  npmGlobalPackages:
    create-react-app: Not Found
```

### Steps to reproduce

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(Write your steps here:)

1. `npx create-react-app test`
2. `cd test`
3. Create `.env.development` file:
```
HOST=test.domain.dev
HTTPS=false
```
4. `yarn start`

### Expected behavior

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Should load the page over http.

### Actual behavior

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it still redirects to HTTPS, and the browser throws an error:

![image](https://user-images.githubusercontent.com/8162417/114900589-3eaa3580-9dd1-11eb-92fb-5810f8a5c15e.png)

### Reproducible demo

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https://github.com/JBaczuk/cra-10831

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