extend filter method safeUrl

[geniv]

I found an interesting thing, the safeUrl method leaves http / https / ftp and mailto protocols in the url. Personally, I think there may be other exceptions nowadays, for example: tel / callto / sms (and even fax) / skype / whatsapp / market / callto; so there is no need to use a solution like "nocheck".

source:

https://css-tricks.com/the-current-state-of-telephone-links/

https://digitalfortress.tech/tricks/creating-direct-click-to-call-sms-links/

https://beradrian.wordpress.com/2010/01/15/special-links/

[dg]

Good idea, I will add tel: & sms: yet.