This refactoring:
* eliminates the need for the external `curl` command
* speeds the test by running the two test requests simultaneously
* checks the type of error in the test that expects a failure
(previously, any error type would cause the test to pass)
PR-URL: https://github.com/nodejs/node/pull/2433
Reviewed-By: Brendan Ashworth <brendan.ashworth@me.com>
Reviewed-By: Sakthipriyan Vairamani <thechargingvolcano@gmail.com>
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