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Relative PUBLIC_URL during development

See original GitHub issue

Describe the bug

I am unable to get relative urls to assets during development, only when building release.

Am I doing something wrong?

{
...
  "homepage": ".",
...
  "scripts": {
    "start": "react-scripts start",
    "build": "react-scripts build",
...
  },
...
}

# building release works as expected
$ yarn build 
✨Done in 4.55s. 
$ grep -o '\"[^\"]*favicon[^\"]*\"' build/index.html
"./favicon.ico"

# homepage value is ignored during development, get absolute assets urls
$ yarn start
$ curl --silent http://localhost:3000 | grep -o '\"[^\"]*favicon[^\"]*\"'
"/favicon.ico"
"/favicon.ico"
"favicon.ico"
"/favicon.ico"

# PUBLIC_URL set to . for relative urls, get absolute urls
$ PUBLIC_URL=. yarn start
$ curl --silent http://localhost:3000 | grep -o '\"[^\"]*favicon[^\"]*\"'
"/favicon.ico"
"/favicon.ico"
"favicon.ico"

# PUBLIC_URL set to /some/path, this works but with absolut path as specified
$ PUBLIC_URL="/some/path" yarn start
$ curl --silent http://localhost:3000 | grep -o '\"[^\"]*favicon[^\"]*\"'
"/some/path/favicon.ico"
"/favicon.ico"
"favicon.ico"
"/some/path/favicon.ico"
"/favicon.ico"

# PUBLIC_URL set to ./some/path, get absolute urls but without specified path
$ PUBLIC_URL="./some/path" yarn start
$ curl --silent http://localhost:3000 | grep -o '\"[^\"]*favicon[^\"]*\"'
"/favicon.ico"
"/favicon.ico"
"favicon.ico"
"/favicon.ico"

Did you try recovering your dependencies?

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Which terms did you search for in User Guide?

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Environment

Environment Info:

  current version of create-react-app: 3.4.1
  running from /Users/USER/.npm/_npx/49546/lib/node_modules/create-react-app

  System:
    OS: macOS 10.15.6
  Binaries:
    Node: 14.7.0 - /usr/local/bin/node
    Yarn: 1.22.4 - /usr/local/bin/yarn
    npm: 6.14.7 - /usr/local/bin/npm
  Browsers:
    Chrome: 84.0.4147.135
    Firefox: 79.0
    Safari: 13.1.2
  npmPackages:
    react: ^16.13.1 => 16.13.1
    react-dom: ^16.13.1 => 16.13.1
    react-scripts: 3.4.3 => 3.4.3
  npmGlobalPackages:
    create-react-app: Not Found