Here's a response to someone who wanted to tweet in arabic:
Not quite sure how the tweeter would know what to put in thier custom txt file.This is likely failing due to an encoding error. Make sure that:
the Arabic is being posted as UTF-8 content.
When POSTing, it's best that "الخيال اهلا وسهلا بكم في عالم" gets sent as "%D8%A7%D9%84%D8%AE%D9%8A%D8%A7%D9%84%20%D8%A7%D9%87%D9%84%D8%A7%20%D9%88%D8%B3%D9%87%D9%84%D8%A7%20%D8%A8%D9%83%D9%85%20%D9%81%D9%8A%20%D8%B9%D8%A7%D9%84%D9%85"
The OAuth signature base string needs to then have that escaped again: "%25D8%25A7%25D9%2584%25D8%25AE%25D9%258A%25D8%25A7%25D9%2584%2520%25D8%25A7%25D9%2587%25D9%2584%25D8%25A7%2520%25D9%2588%25D8%25B3%25D9%2587%25D9%2584%25D8%25A7%2520%25D8%25A8%25D9%2583%25D9%2585%2520%25D9%2581%25D9%258A%2520%25D8%25B9%25D8%25A7%25D9%2584%25D9%2585"