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"""
DefaultHeaders downloader middleware
See documentation in docs/topics/downloader-middleware.rst
"""
from __future__ import annotations
from typing import TYPE_CHECKING
from scrapy.utils.python import without_none_values
if TYPE_CHECKING:
from collections.abc import Iterable
# typing.Self requires Python 3.11
from typing_extensions import Self
from scrapy import Request, Spider
from scrapy.crawler import Crawler
from scrapy.http import Response
class DefaultHeadersMiddleware:
def __init__(self, headers: Iterable[tuple[str, str]]):
self._headers: Iterable[tuple[str, str]] = headers
@classmethod
def from_crawler(cls, crawler: Crawler) -> Self:
headers = without_none_values(crawler.settings["DEFAULT_REQUEST_HEADERS"])
return cls(headers.items())
def process_request(
self, request: Request, spider: Spider
) -> Request | Response | None:
for k, v in self._headers:
request.headers.setdefault(k, v)
return None
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