• Language: en

Source code for 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 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 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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