Please install insomnia for using GraphQL api testing

"query":"query getFileUrl($id: ID!) {
			node(id: $id) {
				... on GenericFile {
							id
							url
							}
					}
			}	

"variables":{
		"id":"gid:https://shopify/GenericFile/25822065655964"
		}

headers = {
  'X-Shopify-Access-Token': 'add you key',
  'Content-Type': 'application/json'
}

conn.request("POST", "/admin/api/2022-01/graphql.json", payload, headers)