bpo-42062: Set HTTPResponse.url at init

[fbidu]

Apparently, HTTPResponse.url is accessed but not set by __init__ nor
any other method. This PR initializes it through __init__

https://bugs.python.org/issue42062

[github-actions]

This PR is stale because it has been open for 30 days with no activity. Remove stale label or comment or this will be closed in 5 days

[MaxwellDupre]

I checked out this branch and modified the end of the your test script to:
a= r1.geturl() print (a) a =r1.url print (a)
And the output was None and None. For either of these to be useful shouldn't they output something other than none?
Also, could you add test(s) to the test module please?

[iritkatriel]

As mentioned above, a PR like this requires a unittest to assert that the bug being fixed does not reappear (though it's not clear that there is a bug here).

[bedevere-bot]

A Python core developer has requested some changes be made to your pull request before we can consider merging it. If you could please address their requests along with any other requests in other reviews from core developers that would be appreciated.

Once you have made the requested changes, please leave a comment on this pull request containing the phrase I have made the requested changes; please review again. I will then notify any core developers who have left a review that you're ready for them to take another look at this pull request.

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