|
|
@@ -638,3 +638,41 @@ class EnsureSafeRedirectURLMiddleware(object):
|
|
|
else:
|
|
|
return response
|
|
|
|
|
|
+# FIXME: This was backported from Django 1.5 to work around streaming generator
|
|
|
+# responses incorrectly getting a length returned with the response. This can
|
|
|
+# be removed once we upgrade.
|
|
|
+class ConditionalGetMiddleware(object):
|
|
|
+ """
|
|
|
+ Handles conditional GET operations. If the response has a 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):
|
|
|
+ from django.utils.http import http_date
|
|
|
+
|
|
|
+ response['Date'] = http_date()
|
|
|
+ if not getattr(response, 'streaming', False) 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
|