Implementing Sign in with Twitter

oauth

#1

Step 1: Obtaining a request token(https://dev.twitter.com/web/sign-in/implementing); I can not pass this step. I always take “Bad Authentication data.” error. I made all things here, but was not success. Please define this step clearly??

I posted below;
Authorization: OAuth oauth_callback=“http%3A%2F%2Flocalhost%3A8080”