Recently have installed Flutter and exploring hello-world app. Followed all steps mentioned at https://flutter.io/get-started/ and was able to run
:: flutt
You might need to setup a self-signed certificate to make it work correctly by setting the following enviroment variables:
On Linux:
export DART_VM_OPTIONS="--root-certs-file={path.to.certificate.file}"
On Windows:
set https_proxy="--root-certs-file={path.to.certificate.file}"