SpringSource/spring-security-oauth — pull request #47 by vedyval (2012-08-31 00:04:31+00:00)
Title: Make a resource-server optionally acquire an OAuth2 access token when required.

If an incoming request does not have a bearer token either as a header or request param,
the resource server can be configured to proactively get an access token by triggering any of the
OAuth2 flows - auth code, implicit, owner password OR client credentials.