Python operates group robots to send pictures

Problem and background

For help, Python drives the DingTalk group robot to send a picture link in Markdown format, and finds the same link, even if the picture corresponding to the link on the website has been replaced, after DingTalk receives the information, the old picture is still displayed.It's like there is a cache at the end of the DingTalk robot.If you change to a new link, Dingding will fetch the data again.

Problem related code, please do not paste screenshot

message = {
"msgtype": "markdown", # with text, "markdown", link, overall jumpActionCard, independent jump ActionCard, FeedCard type, etc.
"markdown": {
"title":"Delivery Progress",
"text": "#### Difference between actual shipment and target shipment aaa \n> As of today\n>

My solution ideas and tried methods

I tried to find a way to clear the DingTalk robot cache, but couldn't find it

My desired outcome

I hope Dingding will refresh the link every time I go to get the latest picture.