Google Distance Matrix Rest模板调用，数字签名生成返回403禁止

import requests
import hashlib
import hmac
import base64
import urllib.parse

# 设置请求参数
origin = "New York, NY"
destination = "San Francisco, CA"
api_key = "YOUR_API_KEY"

# 构建请求URL
url = "https://maps.googleapis.com/maps/api/distancematrix/json"
params = {
    "origins": origin,
    "destinations": destination,
    "key": api_key
}
url += "?" + urllib.parse.urlencode(params)

# 生成数字签名
private_key = "YOUR_PRIVATE_KEY"
signature = hmac.new(private_key.encode(), url.encode(), hashlib.sha1)
encoded_signature = base64.urlsafe_b64encode(signature.digest()).decode()

# 发送请求
headers = {
    "Authorization": "GoogleSignedHeaders keyId=YOUR_KEY_ID,signature=" + encoded_signature
}
response = requests.get(url, headers=headers)

# 处理响应
if response.status_code == 200:
    data = response.json()
    # 在这里处理返回的数据
else:
    print("请求失败，状态码：" + str(response.status_code))