[twitter-dev] Favorites/:id/create.json returns not found

[Jim Cortez]

Hi all,
    I am having trouble with setting favorites through the oAuth API 
(with xAuth). Must other api's work (exception being blocks/exists, see 
previous emails).

Here is an example request:

location: https://api.twitter.com/1/favorites/15738870223/create.json
authorizationHeader: OAuth oauth_consumer_key="<snip>", 
oauth_nonce="<snip>", oauth_signature="<snip>", 
oauth_signature_method="HMAC-SHA1", oauth_timestamp="1276041800", 
oauth_token="<snip>", oauth_version="1.0",
postData: id=15738870223

responseData: 
{"request":"/1/favorites/15738870223/create.json","error":"Not found"}

Now on the web, this is fine:
http://twitter.com/twitterapi/status/15738870223

I tried removing the id as post data, but then I got an invalid 
signature error. Any ideas?
Thanks,
Jim Cortez