38 lines
1.4 KiB
Python
38 lines
1.4 KiB
Python
import datetime
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class ConditionalGetMiddleware:
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"""
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Handles conditional GET operations. If the response has a ETag or
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Last-Modified header, and the request has If-None-Match or
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If-Modified-Since, the response is replaced by an HttpNotModified.
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Removes the content from any response to a HEAD request.
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Also sets the Date and Content-Length response-headers.
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"""
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def process_response(self, request, response):
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now = datetime.datetime.utcnow()
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response['Date'] = now.strftime('%a, %d %b %Y %H:%M:%S GMT')
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if not response.has_header('Content-Length'):
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response['Content-Length'] = str(len(response.content))
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if response.has_header('ETag'):
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if_none_match = request.META.get('HTTP_IF_NONE_MATCH', None)
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if if_none_match == response['ETag']:
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response.status_code = 304
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response.content = ''
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response['Content-Length'] = '0'
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if response.has_header('Last-Modified'):
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last_mod = response['Last-Modified']
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if_modified_since = request.META.get('HTTP_IF_MODIFIED_SINCE', None)
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if if_modified_since == response['Last-Modified']:
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response.status_code = 304
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response.content = ''
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response['Content-Length'] = '0'
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if request.META['REQUEST_METHOD'] == 'HEAD':
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response.content = ''
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return response
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