51 lines
2.1 KiB
Python
51 lines
2.1 KiB
Python
from django.core.exceptions import MiddlewareNotUsed
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from django.utils.http import http_date
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class ConditionalGetMiddleware(object):
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"""
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Handles conditional GET operations. If the response has a ETag or
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Last-Modified header, and the request has If-None-Match or
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If-Modified-Since, the response is replaced by an HttpNotModified.
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Also sets the Date and Content-Length response-headers.
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"""
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def process_response(self, request, response):
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response['Date'] = http_date()
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if not response.has_header('Content-Length'):
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response['Content-Length'] = str(len(response.content))
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if response.has_header('ETag'):
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if_none_match = request.META.get('HTTP_IF_NONE_MATCH', None)
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if if_none_match == response['ETag']:
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# Setting the status is enough here. The response handling path
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# automatically removes content for this status code (in
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# http.conditional_content_removal()).
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response.status_code = 304
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if response.has_header('Last-Modified'):
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if_modified_since = request.META.get('HTTP_IF_MODIFIED_SINCE', None)
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if if_modified_since == response['Last-Modified']:
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# Setting the status code is enough here (same reasons as
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# above).
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response.status_code = 304
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return response
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class SetRemoteAddrFromForwardedFor(object):
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"""
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This middleware has been removed; see the Django 1.1 release notes for
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details.
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It previously set REMOTE_ADDR based on HTTP_X_FORWARDED_FOR. However, after
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investiagtion, it turns out this is impossible to do in a general manner:
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different proxies treat the X-Forwarded-For header differently. Thus, a
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built-in middleware can lead to application-level security problems, and so
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this was removed in Django 1.1
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"""
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def __init__(self):
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import warnings
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warnings.warn("SetRemoteAddrFromForwardedFor has been removed. "
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"See the Django 1.1 release notes for details.",
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category=DeprecationWarning)
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raise MiddlewareNotUsed() |