curl --location --request POST '/get_flash_file_url' \
--header 'Content-Type: application/json' \
--data-raw '{
"fileset_id": "set_123"
}'{
"status": "ok",
"retcode": 0,
"data": {
"url": "http://example.com/flash.jpg"
},
"message": "",
"wording": ""
}