MegghysAPI/Controllers/PublicController.cs

using Microsoft.AspNetCore.Mvc;

namespace MegghysAPI.Controllers
{
    [Route("api/public")]
    [ApiController]
    public class PublicController : MControllerBase
    {
        [HttpGet("header")]
        public IActionResult Header(bool? order = false)
        {
            var headers = Request.Headers.Select(h => $"{h.Key}: {h.Value}");
            if (order == true)
            {
                headers = headers.OrderBy(h => h);
            }
            return Ok(string.Join(Environment.NewLine, headers));
        }
    }
}