500 this.isValidURL is not a function

[Looper-01]

Describe the bug
internal error
500 this.isValidURL is not a function

To Reproduce
Steps to reproduce the behavior:

1. git clone the master branch
2. npm install and run dev
3. visist http://localhost:3000/ then mock a request

Screenshots

[liyasthomas]

5a8c9f5 fixed this issue. Thanks @Looper-01 for quick issue ticket