Using rate limiting in asp net core 7 web api by ip address

Introduction

Rate is an important aspect of web development, especially when it comes to protecting your web API from abuse and ensuring fair usage for all . In this article, we will explore how to implement rate limiting in an ASP.NET Core 7 web API using IP address as the limiting .

Step 1: Install the required packages

Before we can start implementing rate limiting, we need to install the necessary packages. Open your ASP.NET Core 7 project in Studio and navigate to the NuGet Package Manager. Search for and install the packages:

Microsoft.AspNetCore.RateLimiting

Step 2: Configure rate limiting options

Next, we need to configure the rate limiting options in our application's startup class. Open the Startup.cs file and locate the ConfigureServices method. Add the following code to configure the rate limiting options:

Make sure you have a configuration section named “RateLimiting” in your appsettings.json file, you can define the rate limiting options such as the maximum number of allowed per IP address and the time window for counting the requests.

Step 3: Implement rate limiting

Now, let's implement the rate limiting middleware that will handle the rate limiting logic. Create a new class called RateLimitingMiddleware.cs and add the following code:

public class RateLimitingMiddleware
{
    private readonly RequestDelegate _next;
    private readonly IRateLimiter _rateLimiter;

    public RateLimitingMiddleware(RequestDelegate next, IRateLimiter rateLimiter)
    {
        _next = next;
        _rateLimiter = rateLimiter;
    }

    public async Task Invoke(HttpContext context)
    {
        var ipAddress = context.Connection.RemoteIpAddress.ToString();
        var isRateLimited = await _rateLimiter.IsRateLimitedAsync(ipAddress);

        if (isRateLimited)
        {
            context.Response.StatusCode = (int)HttpStatusCode.TooManyRequests;
            await context.Response.WriteAsync("Rate limit exceeded.");
            return;
        }

        await _next(context);
    }
}

This middleware class takes in the next request delegate and an instance of the rate limiter service. It if the current IP address is rate limited and returns a “Too Many Requests” response if the limit is exceeded.

Step 4: Register the rate limiting middleware

Finally, we need to register the rate limiting middleware in our application's startup class. Open the Startup.cs file and locate the Configure method. Add the following code to register the middleware:

This ensures that the rate limiting middleware is executed for every incoming request.

Conclusion

By following these , you can easily implement rate limiting in your ASP.NET Core 7 web API using IP address as the limiting factor. This helps protect your API from abuse and ensures fair usage for all users. Remember to configure the rate limiting options according to your specific requirements.

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