在Scrapy中,Download_Delay和并发请求是两个常用的配置项,用于控制爬虫的下载延迟和并发请求数量。 Download_Delay(下载延迟):它用于设置每个请求之间的延迟时间,以避免对目标网站造成过大的负载压力。通过设置适当的下载延迟,可以降低被目标网站封禁的风险,并提高爬取效率。一般来说,下载延迟的设置应该根据目标网...
DOWNLOAD_DELAY 会影响 CONCURRENT_REQUESTS,不能使并发显现出来。 思考: 当有CONCURRENT_REQUESTS,没有DOWNLOAD_DELAY 时,服务器会在同一时间收到大量的请求。 当有CONCURRENT_REQUESTS,有DOWNLOAD_DELAY 时,服务器不会在同一时间收到大量的请求。
,默认8 CONCURRENT_REQUESTS_PER_DOMAIN = 16 # 默认0,对网站每个IP的最大并发请求,会覆盖上面PER_DOMAIN配置, # 同时DOWNLOAD_DELAY也成了相同...custom_settings = { 'DOWNLOAD_DELAY': 10 ...
下列选项中,用于设置Scrapy默认使用的请求头的是()。A.DEFAULT_REQUEST_HEADERSB.DOWNLOAD_DELAYC.ITEM_PIPELINE
Top Abstract Download delay is the amount of time needed for instructional materials to appear on a Web page on the client computer after the page is accessed from the server; it is a new challenge specific to designing and using Internet-based materials (Davis & Hantula, 2001). Also known...
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A discrete almost periodic competitive system with delay is proposed and analyzed. The system admits a unique almost periodic solution, which is shown to be uniformly asymptotically stable by using the method of Lyapunov function. Some specific numerical examples are provided to verify our analytical ...
Delay between downloads must be not less than 15 min.5个回答 下载之间的延迟必须不小于15分钟。 2013-05-23 12:21:38 回答:匿名下载之间的延迟时间不得少于15分钟。 2013-05-23 12:23:18 回答:匿名下载之间的延迟少于15 min.必须是不是。 2013-05-23 12:24:58 回答:匿名...
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Download Crx File for Audio Delay 0.0.3Audio Delay CRX Package for Chrome • Package Version: 0.0.3 • Updated On: July 10, 2019 • Extension Languages: English • Crx File: bejcdmejkjfhdkemgiliacebajmafjeh-0.0.3-www.Crx4Chrome.com.crx • File Size: 81.19 KB (83139 Bytes) ...