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Code source de django.middleware.http

from django.utils.http import http_date, parse_http_date_safe

[docs]class ConditionalGetMiddleware(object): """ Handles conditional GET operations. If the response has an ETag or Last-Modified header, and the request has If-None-Match or If-Modified-Since, the response is replaced by an HttpNotModified. Also sets the Date and Content-Length response-headers. """ def process_response(self, request, response): response['Date'] = http_date() if not response.streaming and not response.has_header('Content-Length'): response['Content-Length'] = str(len(response.content)) # If-None-Match must be ignored if original result would be anything # other than a 2XX or 304 status. 304 status would result in no change. # http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.26 if 200 <= response.status_code < 300 and response.has_header('ETag'): if_none_match = request.META.get('HTTP_IF_NONE_MATCH') if if_none_match == response['ETag']: # Setting the status is enough here. The response handling path # automatically removes content for this status code (in # http.conditional_content_removal()). response.status_code = 304 # If-Modified-Since must be ignored if the original result was not a 200. # http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.25 if response.status_code == 200 and response.has_header('Last-Modified'): if_modified_since = request.META.get('HTTP_IF_MODIFIED_SINCE') if if_modified_since is not None: if_modified_since = parse_http_date_safe(if_modified_since) if if_modified_since is not None: last_modified = parse_http_date_safe(response['Last-Modified']) if last_modified is not None and last_modified <= if_modified_since: # Setting the status code is enough here (same reasons as # above). response.status_code = 304 return response
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