[FEATURE] Refactor to use `HttpClientFactory` for HTTP client management

Description

We need to refactor the HTTP client integration library to use HttpClientFactory instead of directly instantiating HttpClient. Using HttpClientFactory will help manage the lifecycle of HttpClient instances more effectively, improve performance, and avoid potential issues related to DNS changes and socket exhaustion.

Problem Statement

Current Issue: The library currently instantiates HttpClient directly within the classes, leading to potential problems such as socket exhaustion and inefficient resource management. This approach does not take advantage of the benefits provided by HttpClientFactory.
Impact: Refactoring to use HttpClientFactory will enhance the library's performance and reliability by managing HttpClient instances in a more scalable and efficient manner.

Proposed Solution

Refactor HTTP Client Instantiation:
- Update the library to use HttpClientFactory for creating HttpClient instances instead of direct instantiation.
- Modify the code to inject IHttpClientFactory where needed and use it to obtain HttpClient instances.

Implementation Steps

Update Dependencies:
- Ensure that the project references the necessary NuGet package for HttpClientFactory. If using ASP.NET Core, this is included by default.

Refactor HTTP Client Usage:

Identify all instances where HttpClient is directly instantiated.
Replace these instances with HttpClientFactory by injecting IHttpClientFactory and using it to create HttpClient instances.

public class MyService
{
   private readonly HttpClient _httpClient;

   // Inject IHttpClientFactory into the constructor
   public MyService(IHttpClientFactory httpClientFactory)
   {
       _httpClient = httpClientFactory.CreateClient();
   }

   public async Task<string> GetDataAsync()
   {
       var response = await _httpClient.GetAsync("https://api.example.com/data");
       response.EnsureSuccessStatusCode();
       return await response.Content.ReadAsStringAsync();
   }
}

Configure HttpClientFactory:

If necessary, configure named or typed clients for specific scenarios. This configuration can be done in the Startup.cs or wherever dependency injection is configured.

public void ConfigureServices(IServiceCollection services)
{
   services.AddHttpClient<MyService>(client =>
   {
       client.BaseAddress = new Uri("https://api.example.com/");
       client.DefaultRequestHeaders.Add("Accept", "application/json");
   });
}

Test Refactoring:
- Ensure that all existing tests are updated to reflect the changes in HttpClient instantiation.
- Verify that the refactored code works as expected and that HttpClient is managed properly by the factory.
Documentation:
- Update documentation to reflect the change in how HttpClient instances are created and managed.
- Provide examples of how to use HttpClientFactory with the library.

Additional Notes

Review the impact of these changes on existing functionalities and test thoroughly to ensure that there are no regressions.
Coordinate with the team to ensure that the refactoring aligns with best practices for HttpClient management.!

guibranco / VTEX-SDK-dotnet

[FEATURE] Refactor to use `HttpClientFactory` for HTTP client management #231

Description

Problem Statement

Proposed Solution

Implementation Steps

Additional Notes