URL with protocol

A URL with protocol is a URL that matches the regular expression ^[a-zA-Z]+://. The following are examples of URLs with protocol:

http://cirosantilli.com
https://cirosantilli.com
file:///etc/fstab
ftp://cirosantilli.com

The following aren't:

index.js
../index.js
path/to/index.js
/path/to/index.js
//example.com/path/to/index.js. This one is a bit tricky. Web browsers would consider this as a protocol-relative URL, which technically implies a protocol, although that protocol would be different depending how you are viewing the file, e.g. locally through file:// vs on a with website https://.
For simplicity's sake, we just consider it as a URL without protocol.

 Ancestors

 Incoming links

External link