Modifying response body

[Joe Van Dyk]

2 questions:
Is it possible to return an empty response?  i.e.
  location /empty-response {
    add_header("some-header", "foo-bar");
    # nothing in response body
  }

Is it possible have the response body be only the unique id set by the
userid module?  i.e.
  userid on;
  location /unique-id {
    # response body should be "uid=<cookie's uid>"
  }

Thanks,
Joe
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