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