--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/web/lib/django/middleware/http.py	Wed Jan 20 00:34:04 2010 +0100
@@ -0,0 +1,51 @@
+from django.core.exceptions import MiddlewareNotUsed
+from django.utils.http import http_date
+
+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):
+        response['Date'] = http_date()
+        if 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', None)
+            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', None)
+            if if_modified_since == response['Last-Modified']:
+                # Setting the status code is enough here (same reasons as
+                # above).
+                response.status_code = 304
+
+        return response
+
+class SetRemoteAddrFromForwardedFor(object):
+    """
+    This middleware has been removed; see the Django 1.1 release notes for
+    details.
+    
+    It previously set REMOTE_ADDR based on HTTP_X_FORWARDED_FOR. However, after
+    investiagtion, it turns out this is impossible to do in a general manner:
+    different proxies treat the X-Forwarded-For header differently. Thus, a
+    built-in middleware can lead to application-level security problems, and so
+    this was removed in Django 1.1
+    
+    """
+    def __init__(self):
+        import warnings
+        warnings.warn("SetRemoteAddrFromForwardedFor has been removed. "
+                      "See the Django 1.1 release notes for details.",
+                      category=DeprecationWarning)
+        raise MiddlewareNotUsed()
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