Django Form resubmit issue when press back button

Question

Django Form submit and link to the main page but when press back button, it shows data and ready to submits again. Views.py is here

def contact(request):
    if request.method == "POST":                      
        form = ContactsForm(request.POST, request.FILES)        
        if form.is_valid():   
            
            form.save()    
            form = ContactsForm() 
            messages.success(request, 'Contact request submitted successfully.')      
            return HttpResponseRedirect(request.path_info) 

        else:
            messages.error(request, 'Invalid form submission.')
            
            
    else:
        form = ContactsForm() 

    projects = Projects.objects.filter(status=1).order_by('-updated_at')
    
    return render(request,'main/contact.html',{'contact':'current','projects':projects,'form':form})