Using request.POST.copy() to get hidden field in html template

I'm trying to use request.POST.copy() to get a hidden field in an html
template. The hidden field looks like:

<input type="hidden" value="{% if post.url %}{{ post.url }}{%else
%}""{%endif%}" name="url" />

I also tried:

<input type="hidden" value="{{ post.url }}" name="url" />

In my view.py I have:

postdata = request.POST.copy()
url = str(postdata.get('url'))

The value of url is None. Is there an additional trick to this?

Thanks
Jim

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