Django for loop doesn't display

I'm running into the issue of displaying the button within for-loop tag. When I remove tags {% for user in users %} from send_friend.html, the button is displayed, when I add it again, it's gone.

models.py

class Friend_Request(models.Model):
    from_user = models.ForeignKey(
        User, related_name='from_user', on_delete=models.CASCADE)
    to_user = models.ForeignKey(
        User, related_name='to_user', on_delete=models.CASCADE)

views.py

def send_friend_request(request, pk):
from_user = request.user
to_user = User.objects.get(id=pk)
friend_request, created = Friend_Request.objects.get_or_create(
    from_user=from_user, to_user=to_user)
if created:
    return HttpResponse('friend request sent')
else:
    return HttpResponse('friend request already sent')

send_friend.html

<ul>
  {% for user in allusers %}
  <h1>
    {% if not user.is_superuser %}
    <p></p>
    {% if user not in request.user.friends.all and user != request.user %}
    <a href="/send-friend-request/{{user.id}}" class="btn btn--main btn--pill"
      >Send Friend Requst</a>
    {% elif user in request.user.friends.all %}
    <p>You are friends!</p>

    {% endif %}
    <p></p>
    {% endif %}
  </h1>
  {% endfor %}
</ul>

You need to correctly pass a context to the view. In example:

def your_view(request):
    ...
    context = {"allusers": User.objects.all()}
    return render(..., context=context)