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Clarify that the external_url is unsafe

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Travis Ralston 2018-08-30 11:07:09 -06:00
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4
specification/application_service_api.rst
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@ -385,3 +385,7 @@ where an HTTP URL may be available to reference.
Clients should provide users with a way to access the ``external_url`` if it
is present. Clients should additionally ensure the URL has a scheme of ``https``
or ``http`` before making use of it.
The presence of an ``external_url`` on an event does not necessarily mean the
event was sent from an application service. Clients should be wary of the URL
contained within, as it may not be a legitimate reference to the event's source.