500：创建第一个Web API项目时出现内部服务器错误

Question

我刚刚创建了一个MVC 4应用程序并选择了Empty Web APi模板。 Visual Studio 2012成功创建了该项目。但是，当我使用带有URL http://localhost:48687/的Visual Studio运行应用程序时，我得到500: Internal Server Error（使用Chrome Inspect Element）。浏览器说This Page Cannot Be Displayed。

我们如何纠正它？

参考

1. ASP.NET Web API in MVC tutorial
2. ASP.NET Web API vs. ASP.NET MVC “APIs”
3. REST based CRUD operations with ASP.NET Web API
4. channel9 - Building a Service Layer with ASP.NET Web API
5. channel9 - Building Services for Any Client with ASP.NET Web API
6. channel9 - Build RESTful APIs with ASP.NET Web API
7. channel9 - Securing ASP.NET Web APIs
8. channel9 - Dan Roth Takes Us on a Deep Dive into Web API
9. channel9 - ASP.NET Web API: Web Services for Websites, Modern Apps, and Mobile Apps
10. channel9 - Building HTTP Services with ASP.NET Web API
11. channel9 - Wrapping Up the Web API Tour with Yao Huang Lin
12. msdn - Enabling and Customizing ASP.NET Web API Services Security