HelpPage
http://www.cnblogs.com/pmars/p/3673654.html 如何给你的ASP.NET页面添加HelpPage
WebApi_HelpPage http://www.cnblogs.com/gossip/p/4546630.html
Web API 版本控制的几种方式 http://blog.csdn.net/hengyunabc/article/details/20506345
http://stackoverflow.com/questions/14830391/how-do-i-get-asp-net-web-api-working-with-versioning-and-the-help-page-extension
http://stackoverflow.com/questions/28730307/web-api-routing-and-a-web-api-help-page-how-to-avoid-repeated-entries
http://stackoverflow.com/questions/389169/best-practices-for-api-versioning/398564#398564
http://www.troyhunt.com/2014/02/your-api-versioning-is-wrong-which-is.html
http://www.lexicalscope.com/blog/2012/03/12/how-are-rest-apis-versioned/
http://blogs.msdn.com/b/yaohuang1/archive/2012/08/15/introducing-the-asp-net-web-api-help-page-preview.aspx
http://www.asp.net/web-api/overview/getting-started-with-aspnet-web-api/creating-api-help-pages