Cause
You must wait a few seconds before testing this destination again.
What to do
Wait the seconds in Retry-After.
application/problem+json
{
"type": "https://masnet.com/developers/errors/test_cooldown",
"title": "Test cooldown",
"status": 429,
"detail": "...",
"code": "test_cooldown",
"correlation_id": "..."
}