OAuth Authentication with Twitter API failed! - r

Question

I used R's packages 'twitteR' and 'ROAuth' to access Twitter API.
I tried this R code to register my R session:
tw<-OAuthFactory$new(consumerKey="mykeyhere",consumerSecret="mysecrethere",
requestURL="http://api.twitter.com/oauth/request_token",
accessURL="http://api.twitter.com/oauth/access_token",
authURL="http://api.twitter.com/oauth/authorize")
tw<-handshake()
I used http instead of https because the latter gave me an error of SSL certification fail.
Then, I enter a PIN code obtained from a given URL and registered with Twitter:
registerTwitterOAuth(tw)
The result of the above command was:
[1] TRUE
I think that I successfully registered using OAuth.
However, when I tried to access protected users' profiles, for example,
getURL("http://api.twitter.com/1/followers/ids.json?cursor=-1&user_id=XXXXXXXX")
I got this:
[1] "{\"error\":\"Not authorized\",\"request\":\"\\/1\\/followers\\/ids.json?cursor=-1&user_id=XXXXXXXX\"}"
I also checked my verification by using:
getURL("http://api.twitter.com/1/account/verify_credentials.json")
And this was the result:
[1] "{\"error\":\"Could not authenticate you.\",\"request\":\"\\/1\\/account\\/verify_credentials.json\"}"
Would you mind helping me please?
Thank you very much.

Answer 1

You should use getUser(...),searchTwitter(...),tw$OAuthRequest(...) and so on instead of directly use getURL(...) by yourself because getURL() does not contain session context (which register using registerTwitterOAuth).
example of tw$OAuthRequest http://goo.gl/6IwdU