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"Common" middleware for taking care of some basic operations:
- Forbids access to User-Agents in settings.DISALLOWED_USER_AGENTS
- URL rewriting: Based on the APPEND_SLASH and PREPEND_WWW settings,
this middleware appends missing slashes and/or prepends missing
"www."s.
- If APPEND_SLASH is set and the initial URL doesn't end with a
slash, and it is not found in urlpatterns, a new URL is formed by
appending a slash at the end. If this new URL is found in
urlpatterns, then an HTTP-redirect is returned to this new URL;
otherwise the initial URL is processed as usual.
- ETags: If the USE_ETAGS setting is set, ETags will be calculated from
the entire page content and Not Modified responses will be returned
appropriately.
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Check for denied User-Agents and rewrite the URL based on
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Calculate the ETag, if needed.
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Send broken link emails for relevant 404 NOT FOUND responses.
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Returns True if the referring URL is the same domain as the current request.
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Returns True if the given request *shouldn't* notify the site managers.
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