初识ASP.NET CORE：一、HTTP pipeline
完整的http请求在asp.net framework中的处理流程：
1 Asp.Net 2 HttpRequest--> 3 HTTP.exe--> 4 inetinfo.exe(w3wp.exe)-> 5 ASPNET_ISAPI.DLL--> 6 Http Pipeline-->ASPNET_WP.EXE--> 7 HttpRuntime.Init--> 8 HttpRuntime.ProcessRequest--> 9 ISAPIRuntime.ProcessRequest--> 10 HttpApplication Factory-->HttpApplication--> 11 HttpModule--> 12 HttpHandler Factory-->HttpHandler--> 13 HttpHandler.ProcessRequest() 14 BeginRequest 15 AuthenticateRequest，PostAuthenticateRequest 16 AuthorizeRequest，PostAuthorizeRequest 17 ResolveRequestCache，PostResolveRequestCache 18 PostMapRequestHandler 19 AcquireRequestState，PostAcquireRequestState 20 PreRequestHandlerExecute，PostRequestHandlerExecute 21 ReleaseRequestState，PostReleaseRequestState 22 UpdateRequestCache，PostUpdateRequestCache 23 LogRequest，PostLogRequest 24 EndRequest
1 Asp.Net MVC 2 HttpRequest--> 3 HTTP.exe--> 4 inetinfo.exe(w3wp.exe)-> 5 ASPNET_ISAPI.DLL--> 6 Http Pipeline--> 7 HttpRuntime.Init--> 8 HttpRuntime.ProcessRequest--> 9 ISAPIRuntime.ProcessRequest--> 10 BeginRequest 11 AuthenticateRequest，PostAuthenticateRequest 12 AuthorizeRequest，PostAuthorizeRequest 13 ResolveRequestCache，PostResolveRequestCache 14 MvcHandler 15 AcquireRequestState，PostAcquireRequestState 16 Controllor,Action 17 View 18 EndRequest
1 Asp.Net Core 2 HttpRequest--> 3 Server--> 4 HttpApplication--> 5 MiddleWare(s)(handle features in HttpContext) 6 MiddleWare(s)(handle features in HttpContext) 7 MiddleWare(s)(handle features in HttpContext) 8 (error handling,static file server,authentication,Routing MVC) 9 . 10 . 11 .
