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Fixed #4148 -- Changed the way attachments are served to IE to avoid some
caching and header-related bugs there. Only comes into play when Internet Explorer is the user-agent. Patch from Michael Axiak, with testing from Axis_of_Entropy and Karen Tracey. git-svn-id: http://code.djangoproject.com/svn/django/trunk@7856 bcc190cf-cafb-0310-a4f2-bffc1f526a37
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@ -6,8 +6,12 @@ from django.dispatch import dispatcher
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class BaseHandler(object):
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class BaseHandler(object):
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# Changes that are always applied to a response (in this order).
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# Changes that are always applied to a response (in this order).
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response_fixes = [http.fix_location_header,
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response_fixes = [
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http.conditional_content_removal]
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http.fix_location_header,
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http.conditional_content_removal,
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http.fix_IE_for_attach,
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http.fix_IE_for_vary,
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]
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def __init__(self):
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def __init__(self):
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self._request_middleware = self._view_middleware = self._response_middleware = self._exception_middleware = None
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self._request_middleware = self._view_middleware = self._response_middleware = self._exception_middleware = None
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@ -31,3 +31,54 @@ def conditional_content_removal(request, response):
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if request.method == 'HEAD':
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if request.method == 'HEAD':
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response.content = ''
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response.content = ''
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return response
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return response
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def fix_IE_for_attach(request, response):
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"""
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This function will prevent Django from serving a Content-Disposition header
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while expecting the browser to cache it (only when the browser is IE). This
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leads to IE not allowing the client to download.
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"""
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if 'MSIE' not in request.META.get('HTTP_USER_AGENT', '').upper():
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return response
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offending_headers = ('no-cache', 'no-store')
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if response.has_header('Content-Disposition'):
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try:
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del response['Pragma']
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except KeyError:
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pass
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if response.has_header('Cache-Control'):
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cache_control_values = [value.strip() for value in
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response['Cache-Control'].split(',')
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if value.strip().lower() not in offending_headers]
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if not len(cache_control_values):
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del response['Cache-Control']
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else:
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response['Cache-Control'] = ', '.join(cache_control_values)
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return response
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def fix_IE_for_vary(request, response):
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"""
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This function will fix the bug reported at
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http://support.microsoft.com/kb/824847/en-us?spid=8722&sid=global
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by clearing the Vary header whenever the mime-type is not safe
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enough for Internet Explorer to handle. Poor thing.
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"""
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if 'MSIE' not in request.META.get('HTTP_USER_AGENT', '').upper():
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return response
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# These mime-types that are decreed "Vary-safe" for IE:
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safe_mime_types = ('text/html', 'text/plain', 'text/sgml')
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# The first part of the Content-Type field will be the MIME type,
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# everything after ';', such as character-set, can be ignored.
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if response['Content-Type'].split(';')[0] not in safe_mime_types:
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try:
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del response['Vary']
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except KeyError:
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pass
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return response
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