This function wraps boilerplate code to get the current page in a view, obtaining the page number from some URL query string variable, e.g., ?page=2 The interface is inspired by the interface of Paginator. The implementation follows an example given in Django documentation.
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Search engines might conclude there's duplicate content if `/some_view/` and `/some_view/?page=1` returns the same results. This middleware redirects `?page=1` to the URL without the page parameter. You can set the name of the parameter in settings.py as `PAGE_VAR`. See [here](http://www.muhuk.com/2009/08/a-civilized-way-display-lots-of-data/) for more details.
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