Cause
Only absolute HTTPS links without credentials are accepted.
What to do
Use addresses that start with https:// and carry no username or password.
application/problem+json
{
"type": "https://masnet.com/developers/errors/unsafe_link",
"title": "Unsupported link",
"status": 422,
"detail": "...",
"code": "unsafe_link",
"correlation_id": "..."
}