[1] Draft: OAuth 2.0 Form Post Response Mode - draft 03 (2014-02-26 05:31:42 +09:00 版) http://openid.net/specs/oauth-v2-form-post-response-mode-1_0.html

[2] OpenID Connect 1.0 (2015-03-05 10:56:17 +09:00 版) https://msdn.microsoft.com/en-us/library/azure/dn645541.aspx

response_mode
[Required] Indicates the encoding of the response. Supported values are fragment (URL fragment) and form_post (HTTP form POST).

[3] Final: OAuth 2.0 Multiple Response Type Encoding Practices (2014-02-26 05:28:26 +09:00 版) http://openid.net/specs/oauth-v2-multiple-response-types-1_0.html