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Django middleware for X-UA-Compatible HTTP header
# Copyright (c) 2009, Sunlight Foundation
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without modification,
# are permitted provided that the following conditions are met:
#
# * Redistributions of source code must retain the above copyright notice,
# this list of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above copyright notice,
# this list of conditions and the following disclaimer in the documentation
# and/or other materials provided with the distribution.
# * Neither the name of Sunlight Foundation, Sunlight Labs
# nor the names of its contributors may be used to endorse or promote products
# derived from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
# EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
# THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
# PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
# OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
# STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
from django.conf import settings
from django.core.exceptions import MiddlewareNotUsed
from django.utils.decorators import decorator_from_middleware
CONTENT_TYPES = ('text/html','application/xhtml+xml','application/xml')
HEADER_VALUE = getattr(settings, 'X_UA_COMPATIBLE', 'IE=edge')
class XUACompatibleMiddleware(object):
def __init__(self, value=None):
self.value = value
if value is None:
self.value = HEADER_VALUE
if not self.value:
raise MiddlewareNotUsed
def process_response(self, request, response):
response_ct = response.get('Content-Type','').split(';', 1)[0].lower()
if response_ct in CONTENT_TYPES:
if not 'X-UA-Compatible' in response:
response['X-UA-Compatible'] = self.value
return response
xuacompatible = decorator_from_middleware(XUACompatibleMiddleware)
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