Handling both a ConnectionError and a status code error

Question

I am using requests to get some data from a server, which is done in a while loop. However, every now and then, one of two errors occur. The first is that the status_code of the return from the request is not equal to 200, and this prints out an error message. The second is that a ConnectionError exception is raised.

If I receive either error, I want to keep attempting to get the data. However, I'm not sure how to do this for both types of error.

I know how to handle the ConnectionError exception, for example:

def get_data(self, path):
    # Keep trying until the connection attempt is successful
    while True:
        # Attempt a request
        try:
            request_return = requests.get(path, timeout=30)
            break
        # Handle a connection error
        except ConnectionError as e:
            pass
# Return the data
return request_return.json()

But how can I also handle the status_code in a similar manner? Is it something to do with the raise_for_status() method?

sam · Accepted Answer · 2018-02-18 21:56:52Z

1

Seems like you could just adjust your try/except to look like this:

try:
    request_return = requests.get(path, timeout=30)
    if request_return.status_code == 200:
        break
except ConnectionError as e:
    pass

If you prefer, you can use request_return.status_code == requests.codes.ok as well.

If you're set on handling the request as an exception (for whatever reason), raise_for_status() returns an HTTPError, so you can amend your try/except like this:

try:
    request_return = requests.get(path, timeout=30)
    request_return.raise_for_status()
    break
except ConnectionError as e:
    pass
except HTTPError as e:
    pass

answered Feb 18, 2018 at 21:56

sam

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Community · Accepted Answer · 2020-06-20 09:12:55Z

1

You can test the status code and leave the loop only on a 200 like:

Code:

if request_return.status_code == 200:
    break

Probably should limit the number of retries:

import requests

def get_data(path):
    # Keep trying until the connection attempt is successful
    retries = 5
    while retries > 0:
        # Attempt a request
        try:
            request_return = requests.get(path, timeout=3)
            if request_return.status_code == 200:
                break
        # Handle a connection error
        except ConnectionError as e:
            pass
        retries -= 1

    if retries == 0:
        """ raise an error here """

    # Return the data
    return request_return.json()

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edited Jun 20, 2020 at 9:12

CommunityBot

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answered Feb 18, 2018 at 21:56

Stephen Rauch♦

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Handling both a ConnectionError and a status code error

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Code:

Probably should limit the number of retries:

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2 Answers 2

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Code:

Probably should limit the number of retries:

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