Não sei qual é o erro

Error: connect ECONNREFUSED 127.0.0.1:44310 .O postma nao recebe minha requisao. meuco digo

[Route("api/[controller]")]
[ApiController]
public class ClienteController : ControllerBase
{
    private readonly DonationDBContext _context;

    public ClienteController(DonationDBContext context)
    {
        _context = context;
    }

    // GET: api/Cliente
    [HttpGet]
    public async Task<ActionResult<IEnumerable<Cliente>>> GetClientes()
    {
        return await _context.Clientes.ToListAsync();
    }

    // GET: api/Cliente/5
    [HttpGet("{id}")]
    public async Task<ActionResult<Cliente>> GetCliente(int id)
    {
        var cliente = await _context.Clientes.FindAsync(id);

        if (cliente == null)
        {
            return NotFound();
        }

        return cliente;
    }

    // PUT: api/Cliente/5
    // To protect from overposting attacks, please enable the specific properties you want to bind to, for
    // more details see https://aka.ms/RazorPagesCRUD.
    [HttpPut("{id}")]
    public async Task<IActionResult> PutCliente(int id, Cliente cliente)
    {
        cliente.id = id;

        _context.Entry(cliente).State = EntityState.Modified;

        try
        {
            await _context.SaveChangesAsync();
        }
        catch (DbUpdateConcurrencyException)
        {
            if (!ClienteExists(id))
            {
                return NotFound();
            }
            else
            {
                throw;
            }
        }

        return NoContent();
    }

    private bool ClienteExists(int id)
    {
        throw new NotImplementedException();
    }

    // POST: api/\Cliente
    // To protect from overposting attacks, please enable the specific properties you want to bind to, for
    // more details see https://aka.ms/RazorPagesCRUD.
    [HttpPost]
    public async Task<ActionResult<Cliente>> PostCliente(Cliente cliente)
    {
        _context.Clientes.Add(cliente);
        await _context.SaveChangesAsync();

        return CreatedAtAction("GetCliente", new { id = cliente.id }, cliente);
    }



        // DELETE: api/Cliente/5
        [HttpDelete("{id}")]
        public async Task<ActionResult<Cliente>> DeleteCliente(int id)
        {
            var cliente = await _context.Clientes.FindAsync(id);
            if (cliente == null)
            {
                return NotFound();
            }

            _context.Clientes.Remove(cliente);
            await _context.SaveChangesAsync();

            return cliente;
        }

        private bool DCandidateExists(int id)
        {
            return _context.Clientes.Any(e => e.id == id);
        }
    }
}