[Bug] The URL 'http:/[http//localhost]:3000' is invalid

[Aykelith]

Reporting a bug?

Yes. I just downloaded react-static and wanted to use it, but after I created a basic project and started it I get this in my browser console:

Uncaught SyntaxError: The URL 'http:/[http//localhost]:3000' is invalid at new SockJS (VM20 main.js:47750) at initSocket (VM20 main.js:55343) at Object.<anonymous> (VM20 main.js:54830) at Object.../../webpack-dev-server/client/index.js?http://[http://localhost]:3000 (VM20 main.js:54876) at __webpack_require__ (VM20 main.js:724) at fn (VM20 main.js:101) at Object.0 (VM20 main.js:58287) at __webpack_require__ (VM20 main.js:724) at VM20 main.js:791 at VM20 main.js:794

Environment

System:
OS: Linux 4.15 Linux Mint 19 (Tara)
CPU: (8) x64 Intel(R) Core(TM) i5-8250U CPU @ 1.60GHz
Memory: 786.52 MB / 7.67 GB
Container: Yes
Shell: 4.4.19 - /bin/bash
Binaries:
Node: 10.15.3 - ~/.nvm/versions/node/v10.15.3/bin/node
npm: 6.4.1 - ~/.nvm/versions/node/v10.15.3/bin/npm
Watchman: 4.9.0 - /usr/local/bin/watchman
Browsers:
Chrome: 73.0.3683.103
Firefox: 66.0.2
npmPackages:
react: ^16.8.2 => 16.8.6
react-dom: ^16.8.2 => 16.8.6
react-static: ^7.0.0 => 7.0.7
react-static-plugin-reach-router: ^7.0.0 => 7.0.7
react-static-plugin-sitemap: ^7.0.0 => 7.0.0
react-static-plugin-source-filesystem: ^7.0.0 => 7.0.0
npmGlobalPackages:
react-static: 7.0.7

Steps to Reproduce the problem

1. react-static create
2. choose a template( a only tested with basic and blank)
3. cd into directory
4. run npm run start
5. open http://localhost:3000

Expected Behavior

To show the page with no errors

[Aykelith]

Same as #1109
Sorry