使用Python请求精确捕获DNS错误 [英] Precisely catch DNS error with Python requests
问题描述
我正在尝试使用 python-requests
检查过期的域名.
I am trying to make a check for expired domain name with python-requests
.
import requests
try:
status = requests.head('http://wowsucherror')
except requests.ConnectionError as exc:
print(exc)
这段代码看起来太通用了.它产生以下输出:
This code looks too generic. It produces the following output:
HTTPConnectionPool(host ='wowsucherror',port = 80):URL超过最大重试次数:/(由NewConnectionError(':未能建立新连接:[Errno 11001] getaddrinfo失败',))
HTTPConnectionPool(host='wowsucherror', port=80): Max retries exceeded with url: / (Caused by NewConnectionError(': Failed to establish a new connection: [Errno 11001] getaddrinfo failed',))
我想做的只是仅捕获此DNS错误(例如Chrome中的 ERR_NAME_NOT_RESOLVED
).作为最后的选择,我只能进行字符串匹配,但是也许有更好,更结构化和前向兼容的方式来处理此错误?
What I'd like to do is to catch this DNS error only (like ERR_NAME_NOT_RESOLVED
in Chrome). As a last resort I can just do string matching, but maybe there is a better, more structured and forward compatible way of dealing with this error?
理想情况下,它应该是 requests
的某些 DNSError
扩展名.
Ideally it should be some DNSError
extension to requests
.
更新:Linux上的错误有所不同.
UPDATE: The error on Linux is different.
HTTPConnectionPool(host ='wowsucherror',port = 80):URL超过最大重试次数:/(由NewConnectionError(':导致无法建立新连接:[Errno -2]名称或服务未知',))
HTTPConnectionPool(host='wowsucherror', port=80): Max retries exceeded with url: / (Caused by NewConnectionError(': Failed to establish a new connection: [Errno -2] Name or service not known',))
已将错误报告给 requests
-> urllib3
https://github.com/shazow/urllib3/issues/1003
Reported bug to requests
-> urllib3
https://github.com/shazow/urllib3/issues/1003
UPDATE2 :OS X还报告了不同的错误.
UPDATE2: OS X also reports different error.
requests.exceptions.ConnectionError:HTTPConnectionPool(host ='wowsucherror',port = 80):URL超过最大重试次数:/(由NewConnectionError(':导致:无法建立新连接:[Errno 8]节点名或服务名)提供,还是未知",))
requests.exceptions.ConnectionError: HTTPConnectionPool(host='wowsucherror', port=80): Max retries exceeded with url: / (Caused by NewConnectionError(': Failed to establish a new connection: [Errno 8] nodename nor servname provided, or not known',))
推荐答案
Done this with this hack, but please monitor https://github.com/kennethreitz/requests/issues/3630 for a proper way to appear.
import requests
def sitecheck(url):
status = None
message = ''
try:
resp = requests.head('http://' + url)
status = str(resp.status_code)
except requests.ConnectionError as exc:
# filtering DNS lookup error from other connection errors
# (until https://github.com/shazow/urllib3/issues/1003 is resolved)
if type(exc.message) != requests.packages.urllib3.exceptions.MaxRetryError:
raise
reason = exc.message.reason
if type(reason) != requests.packages.urllib3.exceptions.NewConnectionError:
raise
if type(reason.message) != str:
raise
if ("[Errno 11001] getaddrinfo failed" in reason.message or # Windows
"[Errno -2] Name or service not known" in reason.message or # Linux
"[Errno 8] nodename nor servname " in reason.message): # OS X
message = 'DNSLookupError'
else:
raise
return url, status, message
print sitecheck('wowsucherror')
print sitecheck('google.com')
这篇关于使用Python请求精确捕获DNS错误的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!