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@PostMapping(value = "/quitar/{indice}")
public String quitarDelCarrito(@PathVariable int indice, HttpServletRequest request) {
ArrayList<ProductoParaVender> carrito = this.obtenerCarrito(request);
if (carrito != null && carrito.size() > 0 && carrito.get(indice) != null) {
this.guardarCarrito(carrito, request);
return "redirect:/vender/";
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