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Try changing url(r'^/mypage.html', 'httpi.views.index'), to url(r'^mypage.html/$', 'httpi.views.index'),.
The regex looks like it has an additional starting slash and I would guess that’s what’s throwing it off. The error message says it does not recognize the url you typed in and helpfully points out that you could probably get a valid response at one of the other specified urls. Alternatively, according to the routing you showed here, if you typed in no page beyond your base server url (likely http://localhost:8000/), it would take you to the same view as the one specified at mypage.html.
Source:stackexchange.com