9. OAuth Echo • 認証をService Provider(Twitterなど)に 委譲するしくみ • クライアントがOAuth登録してあれば、 事前の登録やトークン取得が不要 12. POST http://api.twitpic.com/2/upload.json X-Auth-Service-Provider: https://api.twitter.com/1/ account/verify_credentials.json X-Verify-Credentials-Authorization: OAuth oauth_consumer_key="GDdmIQH6jhtmLUypg82g", oauth_nonce="oElnnMTQIZvqvlfXM56aBLAf5noGD0A QR3Fmi7Q6Y", oauth_signature="U1obTfE7Rs9J1ka
![OAuth Echo の Rails Gem](https://cdn-ak-scissors.b.st-hatena.com/image/square/a2490556d980ae4c4a5d545e391dd3ac655b368d/height=288;version=1;width=512/https%3A%2F%2Fcdn.slidesharecdn.com%2Fss_thumbnails%2Foauthecho20111221-111221102409-phpapp02-thumbnail.jpg%3Fwidth%3D640%26height%3D640%26fit%3Dbounds)