How to implement rate limiting in ASP.NET Core

Take advantage of rate limiting in ASP.NET Core to prevent malicious attacks on your web application

When building web applications, you might often want to control the frequency of user requests to prevent malicious attacks. In other words, you might want to limit the number of requests coming from an IP address during a short timespan to mitigate denial-of-service attacks. This process is known as rate limiting.

Rate limiting enables you to control the number of requests that a client can make to an endpoint. Prior to ASP.NET Core, you had to write a lot of boilerplate code to implement rate limiting. However, implementing rate limiting is easy in ASP.NET Core. In this article, we'll examine how we can work with rate limiting in ASP.NET Core.

Create an ASP.NET Core API project

First off, let’s create an ASP.NET Core project in Visual Studio. Assuming Visual Studio 2019 is installed in your system, follow the steps outlined below to create a new ASP.NET Core project in Visual Studio.

  1. Launch the Visual Studio IDE.
  2. Click on “Create new project.”
  3. In the “Create new project” window, select “ASP.NET Core Web Application” from the list of templates displayed.
  4. Click Next. 
  5. In the “Configure your new project” window, specify the name and location for the new project.
  6. Click Create.
  7. In the “Create New ASP.NET Core Web Application” shown next, select .NET Core as the runtime and ASP.NET Core 2.2 (or later) from the drop-down list at the top.
  8. Select “API” as the project template to create a new ASP.NET Core API application. 
  9. Ensure that the check boxes “Enable Docker Support” and “Configure for HTTPS” are unchecked as we won’t be using those features here.
  10. Ensure that Authentication is set as “No Authentication” as we won’t be using authentication either.
  11. Click Create.

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