(9).配置文件

# -*- coding: utf-8 -*-

# Scrapy settings for chouti project
#
# For simplicity, this file contains only settings considered important or
# commonly used. You can find more settings consulting the documentation:
#
#     https://doc.scrapy.org/en/latest/topics/settings.html
#     https://doc.scrapy.org/en/latest/topics/downloader-middleware.html
#     https://doc.scrapy.org/en/latest/topics/spider-middleware.html


BOT_NAME = 'chouti'  # 爬虫的名字

SPIDER_MODULES = ['chouti.spiders']
NEWSPIDER_MODULE = 'chouti.spiders'

# Crawl responsibly by identifying yourself (and your website) on the user-agent

# user-agent表示请求头，可以根据请求头对爬虫进行屏蔽,也可以更改请求头，模拟浏览器
USER_AGENT = 'chouti (+http://www.yourdomain.com)'


# Obey robots.txt rules
ROBOTSTXT_OBEY = True  # 是否遵守robot协议，一般网站都会写一些规定，哪些数据可以爬，哪些不可以爬

# Configure maximum concurrent requests performed by Scrapy (default: 16)
CONCURRENT_REQUESTS = 32  # 并发请求数，这里表示一次发出32个爬虫。并发数越大，每次获取的信息也越多。如果太大，网站可能就会封掉我们的ip

# Configure a delay for requests for the same website (default: 0)
# See https://doc.scrapy.org/en/latest/topics/settings.html#download-delay
# See also autothrottle settings and docs
DOWNLOAD_DELAY = 3  # 延迟，表示没延迟三秒请求一次，如果访问过快，有可能会被反
# The download delay setting will honor only one of:
CONCURRENT_REQUESTS_PER_DOMAIN = 16  # 针对每个域名进行16个并发，比方说我域名写了A站和B站，相当于放出了32个虫子
CONCURRENT_REQUESTS_PER_IP = 16  # 每一个ip进行16个并发。大公司不可能只有一个服务器，而是有很多台，然后对外只有一个域名。当我们访问的时候，进行负载均衡，把请求分配在不同的服务器上。

# Disable cookies (enabled by default)
COOKIES_ENABLED = False  # 是否获取cookie，获取的response是否解析cookie

# Disable Telnet Console (enabled by default)
TELNETCONSOLE_ENABLED = False  # 可以暂停查看状态

# Override the default request headers:
DEFAULT_REQUEST_HEADERS = {
  'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8',
  'Accept-Language': 'en',
}  # 默认的请求头，当然在Request中还可以单独传

# Enable or disable spider middlewares
# See https://doc.scrapy.org/en/latest/topics/spider-middleware.html
# SPIDER_MIDDLEWARES = {
#    'chouti.middlewares.ChoutiSpiderMiddleware': 543,
# }

# Enable or disable downloader middlewares
# See https://doc.scrapy.org/en/latest/topics/downloader-middleware.html
# DOWNLOADER_MIDDLEWARES = {
#    'chouti.middlewares.ChoutiDownloaderMiddleware': 543,
# }

# Enable or disable extensions
# See https://doc.scrapy.org/en/latest/topics/extensions.html
EXTENSIONS = {
   #'scrapy.extensions.telnet.TelnetConsole': None,
    'chouti.extensions.MyExtend': 300
}

# Configure item pipelines
# See https://doc.scrapy.org/en/latest/topics/item-pipeline.html
# ITEM_PIPELINES = {
#    'chouti.pipelines.ChoutiPipeline': 300,
# }

# Enable and configure the AutoThrottle extension (disabled by default)
# See https://doc.scrapy.org/en/latest/topics/autothrottle.html
# AUTOTHROTTLE_ENABLED = True
# The initial download delay
# AUTOTHROTTLE_START_DELAY = 5
# The maximum download delay to be set in case of high latencies
# AUTOTHROTTLE_MAX_DELAY = 60
# The average number of requests Scrapy should be sending in parallel to
# each remote server
# AUTOTHROTTLE_TARGET_CONCURRENCY = 1.0
# Enable showing throttling stats for every response received:
# AUTOTHROTTLE_DEBUG = False
'''
上面一坨是用来做智能限速的
'''

# Enable and configure HTTP caching (disabled by default)
# See https://doc.scrapy.org/en/latest/topics/downloader-middleware.html#httpcache-middleware-settings
# HTTPCACHE_ENABLED = True
# HTTPCACHE_EXPIRATION_SECS = 0
# HTTPCACHE_DIR = 'httpcache'
# HTTPCACHE_IGNORE_HTTP_CODES = []
# HTTPCACHE_STORAGE = 'scrapy.extensions.httpcache.FilesystemCacheStorage'

DEPTH_LIMIT = 0
DEPTH_PRIORITY = 0  # 广度优先还是深度优先，只能是0或者1。0是深度优先，1是广度优先

# 当然在配置文件里，必须指定一下，过滤所用到的类
# 这样才会用我们定义的类进行过滤
#DUPEFILTER_CLASS = 'chouti.duplication.DupeFilter'
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