I got the Server Error "Error in HTTP Request" with Twitter also, although Google works correctly. I deleted the Twitter app, and created a new one, and that one seems to work ok.
Just to clarify, for the Twitter app....
On this add-on's page, it refers to the "Redirect uri for Twitter and VK:". I assume that's what twitter calls its "Callback URL"? i.e. Where to go after authentication is successful?
The "Access Type" for Twitter should be "read only" right?
There shouldn't need to be any change to the OAuth settings, right? Request type is "GET", Request URI is "
https://api.twitter.com/1/"
Thanks for a great add-on