Does not work in a proxified environment #2832

Is this a bug report?

Yes.

I'm trying to initialize a project with create-react-app in an environment, where all connections go through the proxy. To make yarn work I have to execute yarn config set proxy <...> and yarn config set http-proxy <...>. npm requires the same actions as well. When I try to install a package with yarn, everyting works well.

However, create-react-app complains that "You appear to be offline" and fails due to emptiness of yarn local cache. I assume it is connected with proxy, and the create-react-app checking for online connection fails because of proxy.

Is there a workaround for this problem? Can I just disable this checking completely?

Can you also reproduce the problem with npm 4.x?

I haven't tried it, but I guess yes.

Which terms did you search for in User Guide?

There is no answer for this question

Environment

1. node -v: 8.1.2
2. npm -v: 5.0.3
3. yarn --version: 0.27.5

Then, specify:

1. Operating system: Windows 7

Steps to Reproduce

1. Enable a proxy applied to all internet connections (Unfortunately, I don't know details, I just work on this system)
2. Make sure your local yarn config is empty.
3. Execute yarn config set proxy <your proxy here> and yarn config set http-proxy <your proxy here>
4. Try create-react-app <your project name>. It should display: "You appear to be offline".

Expected Behavior

It should detect connection with proxy correctly

or

I should be able to disable checking manually, e.g. with a key --no-offline-mode

Actual Behavior

create-react-app complains: "You appear to be offline" and fails due to emptiness of yarn local cache.