如何防止Python的urllib遵循重定向

import urllib.request
import urllib.error

class NoRedirectHandler(urllib.request.HTTPRedirectHandler):
    def http_error_302(self, req, fp, code, msg, headers):
        raise urllib.error.HTTPError(req.full_url, code, msg, headers, fp)

    def http_error_301(self, req, fp, code, msg, headers):
        raise urllib.error.HTTPError(req.full_url, code, msg, headers, fp)

# 创建一个自定义的 opener
opener = urllib.request.build_opener(NoRedirectHandler())

# 使用自定义的 opener 进行请求
url = 'http://example.com'  # 替换为你要请求的 URL

try:
    response = opener.open(url)
    content = response.read()
    print(content)
except urllib.error.HTTPError as e:
    if e.code in (301, 302):
        print(f"Redirect detected to {e.headers['Location']}")
    else:
        print(f"HTTP Error: {e.code} - {e.reason}")
except Exception as e:
    print(f"Error: {e}")