HTTP Request⚓︎

In C# (and particularly in .NET), you can use the HttpClient class to make HTTP requests. This class is part of the System.Net.Http namespace and provides methods to perform HTTP operations such as GET, POST, PUT, and DELETE.

• HttpClient is a class in the System.Net.Http namespace that allows you to make HTTP requests.

  C#

  using System;
  using System.Net.Http;
  using System.Threading.Tasks;
  
  public class Program
  {
      public static async Task Main(string[] args)
      {
          using HttpClient client = new HttpClient();
          try
          {
              // [GET, POST, PUT, DELETE] is showing below bullet points
              // Like HttpResponseMessage response = await client.[GET, POST, PUT, DELETE]Async("https://api.example.com");
  
              response.EnsureSuccessStatusCode(); // Throw if not 2xx
  
              string responseData = await response.Content.ReadAsStringAsync();
              Console.WriteLine(responseData);
          }
          catch (HttpRequestException e)
          {
              Console.WriteLine($"Request error: {e.Message}");
          }
      }
  }
  

• GET:

  C#

  HttpResponseMessage response = await client.GetAsync("https://api.example.com");
  

• POST:
  C#

  StringContent content = new StringContent("{\"name\":\"value\"}", Encoding.UTF8, "application/json");
  HttpResponseMessage response = await client.PostAsync("https://api.example.com", content);
  

• PUT:
  C#

  StringContent content = new StringContent("{\"name\":\"value\"}", Encoding.UTF8, "application/json");
  HttpResponseMessage response = await client.PutAsync("https://api.example.com/1", content);
  

• DELETE:
  C#

  HttpResponseMessage response = await client.DeleteAsync("https://api.example.com/1");
  

IHttpContextAccessor is an interface in ASP.NET Core that allows you to access the current HTTP context (e.g., request, response, user claims) from places where dependency injection (DI) doesn't normally apply, such as static classes or services that don't have access to the HttpContext.

• In middleware or services that need access to the HttpContext outside the scope of a typical controller or page (in other classes where the HttpContext is not directly available).
• Helps when you need to access request-related information (like headers, cookies, or user identity) from areas without built-in DI support.

• Step 1: Register in Program.cs (or Startup.cs)

  C#

  public void ConfigureServices(IServiceCollection services)
  {
      services.AddHttpContextAccessor(); // Register IHttpContextAccessor
  }
  

• Step 2: Inject and Use in a Service

  C#

  using Microsoft.AspNetCore.Http;
  
  public class MyService
  {
      private readonly IHttpContextAccessor _httpContextAccessor;
  
      public MyService(IHttpContextAccessor httpContextAccessor)
      {
          _httpContextAccessor = httpContextAccessor;
      }
  
      public void LogCurrentUser()
      {
          var userName = _httpContextAccessor.HttpContext?.User?.Identity?.Name;
          Console.WriteLine($"Current User: {userName}");
      }
  }
  

Explanation:

• We register IHttpContextAccessor so that it can be injected where needed.
• In the service, we use it to access the current HttpContext and log the current user.