request類的各種ERROR

urlerror有時候也會是物件

urlerror類繼承自oserror類，是urllib庫的error模組的基類，由request操作產生的異常都可以通過捕獲該類來處理。它具有乙個屬性reason，即返回錯誤的原因。

from urllib.request import

*from urllib.error import
*try
:    response = urlopen(
)except urlerror as e:
print
(e.reason)

not found

from urllib.request import

*from urllib.error import
*try
:     response = urlopen(
"")except urlerror as e:
print
(e.reason)

[errno 11001] getaddrinfo failed

from urllib.request import

*from urllib.error import
*try
:     response = urlopen(
"")except urlerror as e:
print
(e.reason)

[errno 11003] getaddrinfo failed

上面的三個測試，第乙個是訪問存在的知乎**+不存在的部落格名，第二個是訪問不存在的**。第三個是訪問長城之外的**。

import socket

try:
response = urlopen(
'', timeout=
0.01
)except urlerror as e:
print
(type
(e.reason))if
isinstance
(e.reason, socket.timeout)
:print
('time out'
)

time out

它是urlerror的子類，專門用來請求http請求錯誤，包含code， reason和headers三個屬性。

# 先判斷子類error，再判斷父類error，符合包含關係

except urlerror as e:

print

(e.reason)

else

:print

('everything ok'

)

not found

404server: tengine
content-type: text/plain; charset=utf-8
content-length: 9
connection: close
date: mon, 06 jan 2020 14:38:57 gmt
0: cache-control
0: no-cache, no-store, must-revalidate, private, max-age=0
1: connection
1: close
2: content-length
2: 87
3: content-type
4: date
4: mon, 06 jan 2020 14:38:57 gmt
5: expires
5: thu, 01 jan 1970 08:00:00 cst
6: pragma
6: no-cache
7: server
7: openresty
8: vary
8: origin
9: x-backend-response
9: 0.002
10: x-tracing-servicename
10: profile-nweb-go
11: x-tracing-spanname
11: membershandler_get
x-backend-server: heifetz.heifetz.heifetz--951-4de26ba7-7c9d7f9948-hwfqs---10.210.190.133:3000[10.210.190.133:3000]
x-backend-response: 0.069
cache-control: no-cache, no-store, must-revalidate, private, max-age=0
pragma: no-cache
vary: accept-encoding
x-secng-response: 0.07099986076355
set-cookie: _xsrf=z8mbdvxh34t3v5yvbfygftwymjqaxrjr; path=/; domain=zhihu.com; expires=fri, 24-jun-22 14:38:57 gmt
x-lb-timing: 0.071
x-idc-id: 2
x-alicdn-da-ups-status: endos,0,404
x-cdn-provider: alibaba
x-edge-timing: 0.120
via: c28.l2cm12-6(80,0), c17.cn1780(120,0)
timing-allow-origin: *
eagleid: 78f02c2515783215372268582e

​

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