How to get request GET in django, without using form?

Something

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from future import unicode_literals from django.shortcuts import render from products.models import *

def catalog(request): product_id = int(request.GET["value"]) products_images_armatura = products_images.filter(product__category__id=product_id) return render(request, 'shop.html', locals())

#This code says: MultiValueDictKeyError at /catalog/