使用`requests`检查域名是否被注册是否准确？

Question

我注意到请求无效的 url requests.get(invalid_url) 会引发以下异常：

Traceback (most recent call last):
  File "/usr/lib/python3.4/socket.py", line 530, in getaddrinfo
    for res in _socket.getaddrinfo(host, port, family, type, proto, flags):
socket.gaierror: [Errno -2] Name or service not known

During handling of the above exception, another exception occurred:
  File "/usr/lib/python3/dist-packages/urllib3/connectionpool.py", line 607, in urlopen
    raise MaxRetryError(self, url, e)
urllib3.exceptions.MaxRetryError: HTTPConnectionPool(host='sparkandshine.me', port=80): Max retries exceeded with url: / (Caused by <class 'socket.gaierror'>: [Errno -2] Name or service not known)

During handling of the above exception, another exception occurred:
  File "/usr/lib/python3/dist-packages/requests/adapters.py", line 378, in send
    raise ConnectionError(e)
requests.exceptions.ConnectionError: HTTPConnectionPool(host='sparkandshine.me', port=80): Max retries exceeded with url: / (Caused by <class 'socket.gaierror'>: [Errno -2] Name or service not known)

通过捕获那些异常来判断域名是否注册是否准确？源码如下：

#!/usr/bin/env python3
import http
import urllib3
import requests

url = 'http://example.com'
try :
    r = requests.get(url)
except (http.client.HTTPException, urllib3.exceptions.MaxRetryError, requests.exceptions.ConnectionError):
    print(url) #this domain name is not registered?

Answer 1

否；注册域并且没有根域名的 IP 地址是完全可以的，更不用说在该 IP 地址的端口 80 上有服务器运行。

Answer 2

正如@tripleee 所提到的，它不是很精确。我找到了另一种方法来确定域名是否已注册，使用 python 模块 pywhois.

要安装它，

pip install python-whois

这是一个例子。

#!/usr/bin/env python
import whois

url = 'example.com'
try :
    w = whois.whois(url)
except (whois.parser.PywhoisError):
    print(url)

PS: 不支持 python3.

使用`requests`检查域名是否被注册是否准确？

Is it precise to use `requests` to check if a domain name is registered?

python

python-requests

urllib3

http.client