DiscordのWebhookをReqnで流したい

on chat:
    set {_json} to json safe "{""content"": ""Hello from Webhook""}"
    send an http "post" web request to the url "<Webhook>" with header "Content-Type: application/json" and body {_json}

on chat:
    set {_json} to json safe "{""content"": ""Hello from Webhook""}"
    send an http "post" web request to the url "<Webhook>" with header "Content-Type: application/json" and body {_json}