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ASP.NET Core streaming sample

This repository contains sample code for the article "Streaming Responses in ASP.NET Core" in the ASP.NET Core documentation.

What

The project contains two implementations of the definition of a simple ASP.NET Core web site that contains endpoints that sing a song:

  • AsynchronousWithSystemTextJson
  • SynchronousWithNewtonsoftJson

These endpoints sing the song indefinitely, streaming the song repeatedly until the client disconnects. This acts as a demonstration of how to implement streaming endpoints with ASP.NET Core.

Compiling

This project can be compiled in Visual Studio, or with the dotnet command-line tool:

dotnet build

Running

Within Visual Studio, this project will by default run using IIS Express. This can be changed to self-host with Kestrel.

The project can also be launched with the dotnet command-line tool, which self-hosts with Kestrel:

dotnet run

Using

There are two examples that show alternative implementations. With an example server running, you can use a browser window or command-line tools to inspect output from the hosted endpoints. Simply append the desired endpoint onto the base URI displayed in the console where the server is running.

  • Browser: Simply browse to the URL. Some browsers may spool up some of the response before they begin displaying it in realtime.
  • PowerShell: There is no built-in function in PowerShell that can display a web response in realtime.
  • Curl: curl URL --no-buffer
    • NB: Windows 10 ships with a native port of curl.exe -- specify the extension if calling from PowerShell, since PowerShell by default aliases curl to Invoke-WebRequest.
  • Wget: wget -qO- URL

AsynchronousWithSystemTextJson

When running, this project presents a web server with a single endpoint.

  • Controller endpoint: /v1/sing

This project hosts itself on port 5100. A sample URL is:

SynchronousWithNewtonsoftJson

When running, this project presents a web server with two endpoints. These endpoints have identical behaviour, but one is implemented using an ASP.NET Core Controller and the other using ASP.NET Core Middleware.

  • Controller Endpoint: /v1/sing
  • Middleware Endpoint: /middleware/sing

This project hosts itself on port 5000. Sample URLs are: