Ever wonder what that really weird UTF-8 character should look like in an OAuth signature base string or your POST body when sending a REST request? This is an index of nearly every UTF-8 character, grouped by 50 at a time, as passed through a signature base string, POST body -- as well as the unencoded POST body. This is as the OAuth Ruby gem would parse these characters. Twitter interprets characters similarly. There may be some disparities with your own implementation. Though the example is as if setting a Twitter status, not all characters are necessarily valid in a Twitter status update. The format looks like this for every group of 50: signature_base_string: POST&http%3A%2F%2Fapi.t%3A3000%2F1%2Fstatuses%2Fupdate.json&oauth_consumer_key%3Dkey%26oauth_nonce%3DuMBVHXpSuzyat1cO1TO9ubIqXUN9XKUG1G2cm0Sk4%26oauth_signature_method%3DHMAC-SHA1%26oauth_timestamp%3D1275665813%26oauth_version%3D1.0%26status%3D%25C3%2588%25C3%2589%25C3%258A%25C3%258B%25C3%258C%25C3%258D%25C3%258E%25C3%258F%25C3%2590%25C3%2591%25C3%2592%25C3%2593%25C3%2594%25C3%2595%25C3%2596%25C3%2597%25C3%2598%25C3%2599%25C3%259A%25C3%259B%25C3%259C%25C3%259D%25C3%259E%25C3%259F%25C3%25A0%25C3%25A1%25C3%25A2%25C3%25A3%25C3%25A4%25C3%25A5%25C3%25A6%25C3%25A7%25C3%25A8%25C3%25A9%25C3%25AA%25C3%25AB%25C3%25AC%25C3%25AD%25C3%25AE%25C3%25AF%25C3%25B0%25C3%25B1%25C3%25B2%25C3%25B3%25C3%25B4%25C3%25B5%25C3%25B6%25C3%25B7%25C3%25B8%25C3%25B9 body_internal: status=%c3%88%c3%89%c3%8a%c3%8b%c3%8c%c3%8d%c3%8e%c3%8f%c3%90%c3%91%c3%92%c3%93%c3%94%c3%95%c3%96%c3%97%c3%98%c3%99%c3%9a%c3%9b%c3%9c%c3%9d%c3%9e%c3%9f%c3%a0%c3%a1%c3%a2%c3%a3%c3%a4%c3%a5%c3%a6%c3%a7%c3%a8%c3%a9%c3%aa%c3%ab%c3%ac%c3%ad%c3%ae%c3%af%c3%b0%c3%b1%c3%b2%c3%b3%c3%b4%c3%b5%c3%b6%c3%b7%c3%b8%c3%b9 body_unescaped: status=ÈÉÊËÌÍÎÏÐÑÒÓÔÕÖ×ØÙÚÛÜÝÞßàáâãäåæçèéêëìíîïðñòóôõö÷øù ----------------------------- You'll want to git clone this. It's really huge and might not render well on github. Enjoy!