Since Trello API's only supports Oauth 1.0, recently it stopped working for Trello access token. (getRequestToken())
Failing to get access token.

Found similar issues related to it:https://community.developer.atlassian.com/t/error-when-requesting-trello-access-token-response-code-400-message-bad-request-body-null/44737

Also, this happens only for Trello. Twitter v1 API's using Oauth 1.0, seems to be work perfectly fine with ScribeJava.
Please fix this.