Source code for django.middleware.http

from django.utils.cache import get_conditional_response
from django.utils.http import http_date, parse_http_date_safe, unquote_etag

[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)) etag = response.get('ETag') last_modified = response.get('Last-Modified') if last_modified: last_modified = parse_http_date_safe(last_modified) if etag or last_modified: return get_conditional_response( request, etag=unquote_etag(etag), last_modified=last_modified, response=response, ) return response
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