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ASP.NET framework operation Author: Mahesh Sabnis 1、Asynchronously Reading and Writing HTTP Requests and Responses ASP.NET 4.0 introduced the ability to read an HTTP request entity as a stream using the HttpRequest.GetBufferlessInputStream method. This method provided streaming access to the request entity. However, it executed synchronously, which tied up a thread for the duration of a request. ASP.NET 4.5 supports the ability to read streams asynchronously on an HTTP request entity, and the ability to flush asynchronously. ASP.NET 4.5 also gives you the ability to double-buffer an HTTP request entity, which provides easier integration with downstream HTTP handlers such as .aspx page handlers and ASP.NET MVC controllers. (1)Improvements to HttpRequest handling The Stream reference returned by ASP.NET 4.5 from HttpRequest.GetBufferlessInputStream supports both synchronous and asynchronous read methods. The Stream object returned from GetBufferlessInputStream now implements both the BeginRead and EndRead methods. The asynchronous Stream methods let you asynchronously read the request entity in chunks, while ASP.NET releases the current thread between each iteration of an asynchronous read loop. ASP.NET 4.5 has also added a companion method for reading the request entity in a buffered way: HttpRequest.GetBufferedInputStream. This new overload works like GetBufferlessInputStream, supporting both synchronous and asynchronous reads. However, as it reads, GetBufferedInputStream also copies the entity bytes into ASP.NET internal buffers so that downstream modules and handlers can still access the request entity. For example, if some upstream code in the pipeline has already read the request entity using GetBufferedInputStream, you can still use HttpRequest.Form or HttpRequest.Files. This lets you perform asynchronous processing on a request (for example, streaming a large file upload to a database), but still run .aspx pages and MVC ASP.NET controllers afterward. (2)Asyn