Rails + openid-login generator = Parameter action does not match return_to URL

[Tick]

I'm working from the OpenID login generator included in the ruby-openid
2.0.3 gem.  I'm starting a new Rails 2.0.2 project.  The generator
provided me with 'login' and 'complete' actions under my 'openid'
controller.  These begin and complete authentication:

openid_url = params[:openid_url]

if request.post?
  request = consumer.begin(openid_url)

  # CheckIDRequest has no #status; holdover code from old ruby-openid?
  #case request.status
  #when OpenID::SUCCESS
  if request
    return_to = url_for(:action=> 'complete')
    trust_root = url_for(:controller=>'')

    url = request.redirect_url(trust_root, return_to)
    redirect_to(url)
    .
    .
    .


def complete
  response = consumer.complete(params)
  .
  .
  .

I've configured the rest of the skeletal app, and it almost works.  When I
drop in my OpenID I'm redirected to my provider, but after I authorize my
site the 'complete' action tells me that verification failed
(response.status == OpenID::FAILURE), and the response.message is
"Parameter action does not match return_to URL".  Inspecting the params
hash before it's sent to consumer.complete() shows what I think are the
relevant values:

"controller" => "openid"
"action" => "complete"
"openid.mode" => "id_res"
"openid.return_to" => "http://192.168.6.12:3000/openid/complete?..."

The message appears to be coming from openid/consumer/idres.rb:172, but my
Rails-fu isn't strong enough to figure out what that section of code is
supposed to be doing.  Do I need to make changes to my consumer.begin() or
consumer.complete() calls?

Thanks very much for any help.


      ____________________________________________________________________________________
Looking for last minute shopping deals?  
Find them fast with Yahoo! Search.  http://tools.search.yahoo.com/newsearch/category.php?category=shopping