如何通过python slackclient发送application/x-www-form-urlencoded到slack？

from slack import WebClient
import requests

slack_token = "YOUR_SLACK_TOKEN"
client = WebClient(token=slack_token)

data = {
    "channel": "#general",
    "text": "Hello, Slack!",
    "username": "Your Username",
    "icon_emoji": ":smile:"
}

response = requests.post("https://slack.com/api/chat.postMessage", data=data)

if response.status_code == 200:
    print("Message sent successfully!")
else:
    print("Failed to send message. Error:", response.text)