摘要：
0.参考 https://doc.scrapy.org/en/latest/topics/downloader-middleware.html#module-scrapy.downloadermiddlewares.redirect https://doc.scrapy.org/en/latest/ 阅读全文
摘要：
0.参考 https://doc.scrapy.org/en/latest/topics/item-pipeline.html?highlight=mongo#write-items-to-mongodb 20180721新增：异步版本 https://twistedmatrix.com/docum 阅读全文