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Google reCAPTCHA using HttpClient in ASP.NET

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Introduction
reCAPTCHAis a free service that protects your site from spam and abuse. It uses advanced risk analysis techniques to tell humans and bots apart. With the new API, a significant number of your valid human users will pass the reCAPTCHA challenge without having to solve a CAPTCHA.


Building The Code

Before you start, visit this link https://www.google.com/recaptcha/intro/index.html and click on the Get reCAPTCHA button and follow the steps.


























Let's Get started 

Step 1: Create a class or a method in your controller and add the code below.


        public async Task<string> GetRecaptcha()         {             var response = HttpContext.Current.Request["g-recaptcha-response"];             const string secretKey = "your secret key";             var apiConsumer = new ApiConsumer();             const string url = "https://www.google.com/recaptcha/";             apiConsumer.BaseUri = new Uri(url);             apiConsumer.ContentType = ApiConsumer.A…