Accept HTTP_PROXY to specify a fallback server during development

Like proxy in package.json could react-script start also accept the HTTP_PROXY or HTTPS_PROXY environment variables to specify a fallback server during development?

It would be as easy as adding a few lines of code

var proxy = require(paths.appPackageJson).proxy
if (!proxy) {
  proxy = process.env.HTTPS ? process.env.HTTPS_PROXY : process.env.HTTP_PROXY
}

This is useful in situations like mine where some team members don’t use dockers and others do, resulting in different proxy urls.

I’m available to create a PR if you deem this acceptable.

[GameKyuubi]

I am shocked and appalled that HTTPS_PROXY isn’t honored by react-scripts 👎

[gaearon]

I feel like our proxy setup is already pretty complicated and don’t want to complicate it further. IMO the workaround in https://github.com/facebookincubator/create-react-app/issues/1640#issuecomment-328475314 is reasonable, and I suggest using that approach.