Previous fix to this failed to account for open_url returning a filehandle (#20097)

* Previous fix to this failed to account for open_url returning a filehandle

Fixes the bugs introduced by c6fb355

* read() from HTTPError for python-3.6+

HTTPError is funny.  It contains a filehandle to read the response from
and also makes it available via a read() method.  On earlier versions of
python (2 and 3) the read() method was enough to make it work with
json.load().  The newer version of json.load() needs a more complete
file interface than this and has stopped working.  Read the bytes,
transform to str and pass it in manually to fix it.

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