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Checks for the existence of an AWS credential file.
If the environment variable AWS_CREDENTIAL_FILE is
set and points to a file, that file will be read and
will be searched credentials.
Note that if credentials have been explicitelypassed
into the class constructor, those values always take
precedence.
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First checks to see if a url argument was explicitly passed
in. If so, that will be used. If not, it checks for the
existence of the environment variable specified in ENV_URL.
If this is set, it should contain a fully qualified URL to the
service you want to use.
Note that any values passed explicitly to the class constructor
will take precedence.
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