With signpost 1.2:
String authUrl = provider.retrieveRequestToken( consumer, callbackUrl );
Netflix API response:
<status>
  <status_code>
    400
  </status_code>
  <message>
    oauth_consumer_key is missing
  </message>
</status>
I see how to craft the URL manually via the netflix documentation, but this seems to contradict other services which use OAuth authentication. Who's incorrect, here? Is there a way to get signpost to work with Netflix, aside from contributing to the signpost source? :P