ApiHealthCheck.cs

public class ApiHealthCheck : IHealthCheck
{
    private readonly HttpContext _httpContext;

    public ApiHealthCheck(IHttpContextAccessor contextAccessor)
    {
        _httpContext = contextAccessor?.HttpContext;
    }

    public async Task<HealthCheckResult> CheckHealthAsync(HealthCheckContext context, CancellationToken cancellationToken = default)
    {
        try
        {
            using (var httpClient = new HttpClient())
            {
                var url = new Uri($"{_httpContext.Request.Scheme}://{_httpContext.Request.Host}/ping");
                var response = await httpClient.GetAsync(url);
                if (!response.IsSuccessStatusCode)
                {
                    return HealthCheckResult.Unhealthy($"Didn't receive OK response from /ping endpoint. Response Phrase: {response.ReasonPhrase}.");
                }
            }
        }
        catch (Exception ex)
        {
            return HealthCheckResult.Unhealthy($"Error ocurred while connecting to /ping endpoint.", ex);
        }

        return HealthCheckResult.Healthy("API is ready.");
    }
}