def _process_headers(self, request, headers):
cache_key = generate_cache_key(request, headers, self.key_prefix)
if cache_key is None:
# No cache information available, need to rebuild.
request._cache_update_cache = True
return
response = cache_backend.get(cache_key, None)
if response is None:
# No cache information available, need to rebuild.
request._cache_update_cache = True
return None
# Check the Etag/Last-Modified headers of the cache response.
etag = response.has_header('Etag') and response['Etag']
last_modified = response.has_header('Last-Modified') and response['Last-Modified']
if not_modified(request, etag, last_modified):
# Nothing changed since they last downloaded it.
request._cache_update_cache = False
return HttpResponseNotModified()
request._cache_update_cache = False
response['X-From-Cache'] = True
return response
def _process_headers(self, request, headers):
cache_key = generate_cache_key(request, headers, self.key_prefix)
if cache_key is None:
# No cache information available, need to rebuild.
request._cache_update_cache = True
return
response = cache_backend.get(cache_key, None)
if response is None:
# No cache information available, need to rebuild.
request._cache_update_cache = True
return None
# Check the Etag/Last-Modified headers of the cache response.
etag = response.has_header('Etag') and response['Etag']
last_modified = response.has_header(
'Last-Modified') and response['Last-Modified']
if not_modified(request, etag, last_modified):
# Nothing changed since they last downloaded it.
request._cache_update_cache = False
return HttpResponseNotModified()
request._cache_update_cache = False
response['X-From-Cache'] = True
return response
def process_request(self, request):
if request.method == 'PURGE':
# TODO: check request IP address against a setting
if False:
request.method = 'GET'
request._cache_update_cache = True
request._purging = True
return
else:
request._cache_update_cache = False
return HttpResponseForbidden(
'Your address is now allowed to make purge requests.')
if request.method not in ('GET', 'HEAD') or request.is_secure():
# Don't bother checking the cache.
request._cache_update_cache = False
return
headers = get_cached_headers(request, self.key_prefix)
if headers is None:
# No cache information available, need to rebuild.
request._cache_update_cache = True
return
if 'X-Vary-On-View' in headers:
# Handle this request during the process_view phase.
request._cache_middleware_headers = headers
return
# There is no vary, so we can check the Etag/Last-Modified headers.
# Make sure that these headers are popped off the dictionary, because
# they were not used when generating the response cache key.
etag = headers.pop('HTTP_ETAG', None)
last_modified = headers.pop('HTTP_LAST_MODIFIED', None)
if not_modified(request, etag, last_modified):
# Nothing changed since they last downloaded it.
request._cache_update_cache = False
return HttpResponseNotModified()
# Try to return a cached response, using the request + cached headers.
return self._process_headers(request, headers)
def process_request(self, request):
if request.method == 'PURGE':
# TODO: check request IP address against a setting
if False:
request.method = 'GET'
request._cache_update_cache = True
request._purging = True
return
else:
request._cache_update_cache = False
return HttpResponseForbidden('Your address is now allowed to make purge requests.')
if request.method not in ('GET', 'HEAD') or request.is_secure():
# Don't bother checking the cache.
request._cache_update_cache = False
return
headers = get_cached_headers(request, self.key_prefix)
if headers is None:
# No cache information available, need to rebuild.
request._cache_update_cache = True
return
if 'X-Vary-On-View' in headers:
# Handle this request during the process_view phase.
request._cache_middleware_headers = headers
return
# There is no vary, so we can check the Etag/Last-Modified headers.
# Make sure that these headers are popped off the dictionary, because
# they were not used when generating the response cache key.
etag = headers.pop('HTTP_ETAG', None)
last_modified = headers.pop('HTTP_LAST_MODIFIED', None)
if not_modified(request, etag, last_modified):
# Nothing changed since they last downloaded it.
request._cache_update_cache = False
return HttpResponseNotModified()
# Try to return a cached response, using the request + cached headers.
return self._process_headers(request, headers)