Using Context Processor as form with HttpResponseRedirect

Hi i have seen alot of people saying to use a context processor to
include forms in multiple page. I have written a context processor
login form that just returns the django Authentication form and
everything works great including the form.errors etc except that I
cant seem to redirect from the context processor after is_valid is
called. Are context processors not supposed ot be used in this way? My
thoughts inititally were that if it seems to support a request and can
do the validation why not? Basically stuck on using
HttpResponseRedirect in a context processor. I have managed to get
this working by passing a variable called redirect in the dictionary
returned to my template and then saying if the redirect tag is
available use the browsers meta tag to redirect me but i dont think
this is the way it should work. code below please advise thanks.

context_processors.py

from django.contrib.auth.forms import AuthenticationForm
from django.http import HttpResponseRedirect

def login_form(request):
if request.method == 'POST':
form = AuthenticationForm(data=request.POST)
if form.is_valid():
#return HttpResponseRedirect('/home') ONLY THING THATS NOT
WORKING
return {'login_form': form, 'redirect': '/home'}
else:
form = AuthenticationForm(request)
return {'login_form': form}

template.html
{{ form.non_field_errors}} # works fine after post with errors showing
{{ form.username}}
{{ form.password}}
{% if redirect %}
<meta http-equiv="REFRESH" content="0;url={{ redirect }}">
{% endif %}

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