GithubService.cs

public class GithubService {
    private IHttpClientFactory httpClientFactory;
    private static string GITHUB_API_URL = "https://api.github.com";

    public GithubService(IHttpClientFactory clientFactory) {
        httpClientFactory = clientFactory;
    }

    public async Task<List<GithubRepository>> FetchUserRepositories(string username) {
        var repositories = new List<GithubRepository>();
        if (!string.IsNullOrEmpty(username)) {
            var httpClient = httpClientFactory.CreateClient();
            string reposUrl = GetUserReposUrl(username);
            Console.WriteLine(reposUrl);
            httpClient.DefaultRequestHeaders.UserAgent.TryParseAdd("request");
            var apiResponse = await httpClient.GetAsync(reposUrl);
            if (apiResponse.IsSuccessStatusCode) {
                string json = await apiResponse.Content.ReadAsStringAsync();
                repositories.AddRange(JsonConvert.DeserializeObject<List<GithubRepository>>(json));
            }
        }
        return repositories;
    }

    private static string GetUserReposUrl(string username) {
        return $"{GITHUB_API_URL}/users/{username}/repos";
    }
}