python request error handling

Question

I am writing some small python app which uses requests to get and post data to an html page.

now the problem I am having is that if I can't reach the html page the code stops with a max retries exceeded. I want to be able to do some things if I can't reach the server.

is such a thing possible?

here is sample code:

import requests

url = "http://127.0.0.1/"
req = requests.get(url)
if req.status_code == 304:
    #do something
elif req.status_code == 404:
    #do something else
# etc etc 

# code here if server can`t be reached for whatever reason

score 4 · Accepted Answer · answered May 15 '14 at 16:51

4

You want to handle the exception requests.exceptions.ConnectionError, like so:

try:
    req = requests.get(url)
except requests.exceptions.ConnectionError as e:
    # Do stuff here

answered May 15 '14 at 16:51

TML

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If I want to catch all exception, not just connectionerror can I remove the stuff after except? Thank you for your quick answer – May 15 '14 at 17:13
Sure; but, generally speaking, I prefer to handle different classes of exception in different ways, so you might want to think carefully about how you apply that logic. – TML May 15 '14 at 17:15

score 1 · Answer 2 · edited May 23 '17 at 12:13

1

You may want to set a suitable timeout when catching ConnectionError:

url = "http://www.stackoverflow.com"

try:
    req = requests.get(url, timeout=2)  #2 seconds timeout
except requests.exceptions.ConnectionError as e:
    # Couldn't connect

See this answer if you want to change the number of retries.

edited May 23 '17 at 12:13

Community

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answered May 15 '14 at 17:23

lpszBar

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python request error handling

2 Answers2