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Viewing changes to trunk/python-packages/django/middleware/gzip.py

  • Committer: Matthew Nuzum
  • Date: 2008-11-13 05:46:03 UTC
  • Revision ID: matthew.nuzum@canonical.com-20081113054603-v0kvr6z6xyexvqt3
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trunk/python-packages/django/middleware/gzip.py
 
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import re
 
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from django.utils.text import compress_string
 
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from django.utils.cache import patch_vary_headers
 
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re_accepts_gzip = re.compile(r'\bgzip\b')
 
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class GZipMiddleware(object):
 
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    """
 
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    This middleware compresses content if the browser allows gzip compression.
 
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    It sets the Vary header accordingly, so that caches will base their storage
 
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    on the Accept-Encoding header.
 
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    """
 
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    def process_response(self, request, response):
 
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        # It's not worth compressing non-OK or really short responses.
 
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        if response.status_code != 200 or len(response.content) < 200:
 
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            return response
 
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        patch_vary_headers(response, ('Accept-Encoding',))
 
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        # Avoid gzipping if we've already got a content-encoding.
 
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        if response.has_header('Content-Encoding'):
 
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            return response
 
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        # Older versions of IE have issues with gzipped pages containing either
 
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        # Javascript and PDF.
 
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        if "msie" in request.META.get('HTTP_USER_AGENT', '').lower():
 
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            ctype = response.get('Content-Type', '').lower()
 
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            if "javascript" in ctype or ctype == "application/pdf":
 
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                return response
 
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        ae = request.META.get('HTTP_ACCEPT_ENCODING', '')
 
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        if not re_accepts_gzip.search(ae):
 
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            return response
 
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        response.content = compress_string(response.content)
 
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        response['Content-Encoding'] = 'gzip'
 
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        response['Content-Length'] = str(len(response.content))
 
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        return response