npm ERR! network request to http:
You seem to be behind an incorrect proxy for npm download.
You need to configure the proxy as shared here:
Using npm behind a corporate proxy - Wil Boayue[
^]
BTW, before above, in case you have not tried, give this a shot:
npm install -g yarn
yarn global add create-react-app
create-react-app my-app
Hope this helps!