I am using the Python requests library to implement retry logic. Here is a simple script I made to reproduce the problem that I am having. In the case where we run out of retries, I would like to be able to log at least one of the responses from the server to help debugging. However, it is not clear to me how to access that information. Of course, I could implement retries in some other way to accomplish my goal, but it seemed like this wasn't that much of an edge case and I would be surprised to find out that requests did not support my use case.

I have looked at the requests.exceptions.RetryError, the requests.packages.urllib3.exceptions.MaxRetryError that it wraps, and the requests.packages.urllib3.exceptions.ResponseError that that wraps all to no avail.

Am I missing something?

#!/usr/bin/env pythonimport requests
from requests.adapters import HTTPAdapter
from requests.packages.urllib3.util.retry import Retry
from requests.exceptions import RetryErrordef main():retry_policy = Retry(total=3,status_forcelist=[418])session = requests.Session()session.mount('http://', HTTPAdapter(max_retries=retry_policy))try:session.get('http://httpbin.org/status/418')except RetryError as retry_error:print retry_errorprint retry_error.response is Noneif __name__ == '__main__':main()

$ python test.py

HTTPConnectionPool(host='httpbin.org', port=80): Max retries exceeded with url: /status/418 (Caused by ResponseError('too many 418 error responses',))True

Checking out the urllib3 source, I discovered that the Retry object takes a named parameter called raise_on_status. True is the default. When set to False, running into the retry limit causes a response to be returned instead of an exception being thrown. The code below shows me causing an HTTPError (containing the Response) to be thrown by using the raise_for_status method on the Response, but one could just as easily use the Response directly.

#!/usr/bin/env pythonimport requests
from requests.adapters import HTTPAdapter
from requests.packages.urllib3.util.retry import Retry
from requests.exceptions import HTTPErrordef main():retry_policy = Retry(total=3,status_forcelist=[418],raise_on_status=False)session = requests.Session()session.mount('http://', HTTPAdapter(max_retries=retry_policy))try:response = session.get('http://httpbin.org/status/418')response.raise_for_status()except HTTPError as e:print e.response.status_codeprint e.response.contentif __name__ == '__main__':main()

$ python test.py

418-=[ teapot ]=-_...._.'  _ _ `.
| ."` ^ `". _,
\_;`"---"`|//|       ;/\_     _/`"""`