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"""
DefaultHeaders downloader middleware
See documentation in docs/topics/downloader-middleware.rst
"""
from scrapy import conf
from scrapy.utils.python import WeakKeyCache
class DefaultHeadersMiddleware(object):
def __init__(self, settings=conf.settings):
self._headers = WeakKeyCache(self._default_headers)
def _default_headers(self, spider):
return spider.settings.get('DEFAULT_REQUEST_HEADERS').items()
def process_request(self, request, spider):
for k, v in self._headers[spider]:
request.headers.setdefault(k, v)
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