title: How can I Use LINE Notify to send image only
body: <p>How can I Use LINE Notify to send image only</p>
  
  <p>my code below (it works when message and image were sent at the same time):</p>
  
  <p><code>def lineNotifyMessage(token, message, picurl):
        header = {
            "Authorization": "Bearer " + token, 
            "Content-Type" : "application/x-www-form-urlencoded"
        }
        payload = {
            'message':message,
            'imageThumbnail':picurl,
            'imageFullsize':picurl
        }
        r = requests.post("https://notify-api.line.me/api/notify", headers = header, data = payload)
        return r.status_code</code></p>
  
  <hr>
  
  <p>but when I change code below, it doesn't work(actually I want to send the only image by LINE Notify):</p>
  
  <p><code>def lineNotifyMessage_photo(token, picurl):
        header = {
            "Authorization": "Bearer " + token, 
            "Content-Type" : "application/x-www-form-urlencoded"
        }
        payload = {
            'imageThumbnail':picurl,
            'imageFullsize':picurl
        }
        r = requests.post("https://notify-api.line.me/api/notify", headers = header, data = payload)
        return r.status_code</code></p>