400 status code 'oauth_callback parameter required.' message

Question

Trying to get a request token, I am getting a 400 status code with a 'oauth_callback parameter required.' message.  I am using the Authentication header method in this form:
Authorization: OAuth oauth_callback="oob", oauth_consumer_key="<snip>", oauth_version="1.0", oauth_signature_method="PLAINTEXT", oauth_timestamp="1282250439", oauth_nonce="2424374763941556559", oauth_signature="<snip>"
This is going to https://streamwork.com/oauth/request_token.  The oauth_callback method is clearly there.  Why would it not be picking it up?

Answer 1

Have you specified the callback URL when registering your application? Because "oob" means it takes the callback URL when the application was register?  Check documentation [here|https://streamwork.com/api/Call_StreamWork_through_consumer_application_to_get_a_request_token.html] If not, please do it.
If you have done it and your application isn't working, there is an alternative to invoke the callback. You can send the callback URL itself instead of "oob". This overrides the callback URL specified during registration.
So you can have something like:
OAuth oauth_callback="http://myapp.com"
Regards,
Arpit