Is it possible to enable Safety Mode in YouTube via a URL parameter? If so, how is this accomplished?
I am interested in doing this for an iOS app, as well as for a router rule.
YouTube Safety Mode is only managed through cookies rather than URL parameters. This is likely a decision made to stop people inadvertently having Safety Mode enabled by clicking on a random YouTube link.
To force Safety Mode, proxies can directly manipulate the cookie headers of outgoing requests, for example on this Bluecoat article you can see the script appending