yikes, yes, that service is required and the psiturk client will fail if it is down.
we should open an issue on github to either replace this
service with something we have control over (e.g., hosting something similar on
psiturk.org)
or provide a fall back service in case one doesn't work.
this service is needed to determine the user's "real" external ip address since if you are on wifi your
computer may report an internet DHCP address.
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