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Setting a variable in middleware to access a template

It seems to me hard to set a variable in one of my middleware classes, which I can access in the template.

The basic layout is as follows:

class TheMiddleware(object):
    def __init__(self, etc):
        stuff...

    def process_response(self, request, response):
        request.my_var = "whatever"
        return response

Then on the template for another view, I have:

{% custom_tag arg_a %}

What is a template tag that should return a variable from a request:

@register.simple_tag
def custom_tag(arg_a):
    return threading.currentThread().request.my_var

This is a bug with "Caught AttributeError when rendering: WSGIRequest object does not have attribute 'my_var'"

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    request.my_var = "whatever"
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