Scrapy settings.py file or Saving Your IP getting BAN


Here’s a list of all available Scrapy settings, in alphabetical order, along with their default values and the scope where they apply.
The scope, where available, shows where the setting is being used, if it’s tied to any particular component. In that case the module of that component will be shown, typically an extension, middleware or pipeline. It also means that the component must be enabled in order for the setting to have any effect.

AWS_ACCESS_KEY_ID

Default: None
The AWS access key used by code that requires access to Amazon Web services, such as the S3 feed storage backend.

AWS_SECRET_ACCESS_KEY

Default: None
The AWS secret key used by code that requires access to Amazon Web services, such as the S3 feed storage backend.

BOT_NAME

Default: 'scrapybot'
The name of the bot implemented by this Scrapy project (also known as the project name). This will be used to construct the User-Agent by default, and also for logging.
It’s automatically populated with your project name when you create your project with the startproject command.

Change your Bot_Name to a Specific USER_AGENT to Scrape a Site

CONCURRENT_ITEMS

Default: 100
Maximum number of concurrent items (per response) to process in parallel in the Item Processor (also known as the Item Pipeline).

Keep CONCURRENT_ITEMS Variable

CONCURRENT_REQUESTS

Default: 16
The maximum number of concurrent (ie. simultaneous) requests that will be performed by the Scrapy downloader.

Change your CONCURRENT_REQUESTS according to a website. A website can detect your BOT Having multiple requests From Same IP and User Agent.

CONCURRENT_REQUESTS_PER_DOMAIN

Default: 8
The maximum number of concurrent (ie. simultaneous) requests that will be performed to any single domain.

CONCURRENT_REQUESTS_PER_IP

Default: 0
The maximum number of concurrent (ie. simultaneous) requests that will be performed to any single IP. If non-zero, the CONCURRENT_REQUESTS_PER_DOMAIN setting is ignored, and this one is used instead. In other words, concurrency limits will be applied per IP, not per domain.
This setting also affects DOWNLOAD_DELAY: if CONCURRENT_REQUESTS_PER_IP is non-zero, download delay is enforced per IP, not per domain.

From Here You Can Choose to send concurrent requests to a serve. Keep It According to website security parameters. Too much concurrent requests to a server can ban your BOT 

DEFAULT_ITEM_CLASS

Default: 'scrapy.item.Item'
The default class that will be used for instantiating items in the the Scrapy shell.

DEFAULT_REQUEST_HEADERS

Default:
{
    'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8',
    'Accept-Language': 'en',
}
The default headers used for Scrapy HTTP Requests. They’re populated in the DefaultHeadersMiddleware.

You Can Use Website Headers Here For Making Your BOT a Human

DEPTH_LIMIT

Default: 0
The maximum depth that will be allowed to crawl for any site. If zero, no limit will be imposed.

If You are Using Rule's In YOur Crawler than it is advisable to Use DEPTH_LIMIT 

DEPTH_PRIORITY

Default: 0
An integer that is used to adjust the request priority based on its depth.
If zero, no priority adjustment is made from depth.

DEPTH_STATS

Default: True
Whether to collect maximum depth stats.

DEPTH_STATS_VERBOSE

Default: False
Whether to collect verbose depth stats. If this is enabled, the number of requests for each depth is collected in the stats.

DNSCACHE_ENABLED

Default: True
Whether to enable DNS in-memory cache.

DOWNLOADER_DEBUG

Default: False
Whether to enable the Downloader debugging mode.

DOWNLOADER_MIDDLEWARES

Default:: {}
A dict containing the downloader middlewares enabled in your project, and their orders. For more info see Activating a downloader middleware.

DOWNLOADER_MIDDLEWARES_BASE

Default:
{
    'scrapy.contrib.downloadermiddleware.robotstxt.RobotsTxtMiddleware': 100,
    'scrapy.contrib.downloadermiddleware.httpauth.HttpAuthMiddleware': 300,
    'scrapy.contrib.downloadermiddleware.downloadtimeout.DownloadTimeoutMiddleware': 350,
    'scrapy.contrib.downloadermiddleware.useragent.UserAgentMiddleware': 400,
    'scrapy.contrib.downloadermiddleware.retry.RetryMiddleware': 500,
    'scrapy.contrib.downloadermiddleware.defaultheaders.DefaultHeadersMiddleware': 550,
    'scrapy.contrib.downloadermiddleware.redirect.MetaRefreshMiddleware': 580,
    'scrapy.contrib.downloadermiddleware.httpcompression.HttpCompressionMiddleware': 590,
    'scrapy.contrib.downloadermiddleware.redirect.RedirectMiddleware': 600,
    'scrapy.contrib.downloadermiddleware.cookies.CookiesMiddleware': 700,
    'scrapy.contrib.downloadermiddleware.httpproxy.HttpProxyMiddleware': 750,
    'scrapy.contrib.downloadermiddleware.chunked.ChunkedTransferMiddleware': 830,
    'scrapy.contrib.downloadermiddleware.stats.DownloaderStats': 850,
    'scrapy.contrib.downloadermiddleware.httpcache.HttpCacheMiddleware': 900,
}
A dict containing the downloader middlewares enabled by default in Scrapy. You should never modify this setting in your project, modify DOWNLOADER_MIDDLEWARES instead.

DOWNLOADER_STATS

Default: True
Whether to enable downloader stats collection.

DOWNLOAD_DELAY

Default: 0
The amount of time (in secs) that the downloader should wait before downloading consecutive pages from the same website. This can be used to throttle the crawling speed to avoid hitting servers too hard. Decimal numbers are supported. Example:
DOWNLOAD_DELAY = 0.25    # 250 ms of delay
This setting is also affected by the RANDOMIZE_DOWNLOAD_DELAY setting (which is enabled by default). By default, Scrapy doesn’t wait a fixed amount of time between requests, but uses a random interval between 0.5 and 1.5 * DOWNLOAD_DELAY.
When CONCURRENT_REQUESTS_PER_IP is non-zero, delays are enforced per ip address instead of per domain.
You can also change this setting per spider by setting download_delay spider attribute.

Keep Your Download_Delay Variable using range()

DOWNLOAD_HANDLERS

Default: {}
A dict containing the request downloader handlers enabled in your project. See DOWNLOAD_HANDLERS_BASE for example format.

DOWNLOAD_HANDLERS_BASE

Default:
{
    'file': 'scrapy.core.downloader.handlers.file.FileDownloadHandler',
    'http': 'scrapy.core.downloader.handlers.http.HttpDownloadHandler',
    'https': 'scrapy.core.downloader.handlers.http.HttpDownloadHandler',
    's3': 'scrapy.core.downloader.handlers.s3.S3DownloadHandler',
}
A dict containing the request download handlers enabled by default in Scrapy. You should never modify this setting in your project, modify DOWNLOAD_HANDLERS instead.

DOWNLOAD_TIMEOUT

Default: 180
The amount of time (in secs) that the downloader will wait before timing out.

DUPEFILTER_CLASS

Default: 'scrapy.dupefilter.RFPDupeFilter'
The class used to detect and filter duplicate requests.
The default (RFPDupeFilter) filters based on request fingerprint using the scrapy.utils.request.request_fingerprint function.

EDITOR

Default: depends on the environment
The editor to use for editing spiders with the edit command. It defaults to the EDITOR environment variable, if set. Otherwise, it defaults to vi (on Unix systems) or the IDLE editor (on Windows).

EXTENSIONS

Default:: {}
A dict containing the extensions enabled in your project, and their orders.

EXTENSIONS_BASE

Default:
{
    'scrapy.contrib.corestats.CoreStats': 0,
    'scrapy.webservice.WebService': 0,
    'scrapy.telnet.TelnetConsole': 0,
    'scrapy.contrib.memusage.MemoryUsage': 0,
    'scrapy.contrib.memdebug.MemoryDebugger': 0,
    'scrapy.contrib.closespider.CloseSpider': 0,
    'scrapy.contrib.feedexport.FeedExporter': 0,
    'scrapy.contrib.logstats.LogStats': 0,
    'scrapy.contrib.spiderstate.SpiderState': 0,
    'scrapy.contrib.throttle.AutoThrottle': 0,
}
The list of available extensions. Keep in mind that some of them need to be enabled through a setting. By default, this setting contains all stable built-in extensions.

ITEM_PIPELINES

Default: {}
A dict containing the item pipelines to use, and their orders. The dict is empty by default order values are arbitrary but it’s customary to define them in the 0-1000 range.
Lists are supported in ITEM_PIPELINES for backwards compatibility, but they are deprecated.
Example:
ITEM_PIPELINES = {
    'mybot.pipeline.validate.ValidateMyItem': 300,
    'mybot.pipeline.validate.StoreMyItem': 800,
}

ITEM_PIPELINES_BASE

Default: {}
A dict containing the pipelines enabled by default in Scrapy. You should never modify this setting in your project, modify ITEM_PIPELINES instead.

LOG_ENABLED

Default: True
Whether to enable logging.

LOG_ENCODING

Default: 'utf-8'
The encoding to use for logging.

LOG_FILE

Default: None
File name to use for logging output. If None, standard error will be used.

LOG_LEVEL

Default: 'DEBUG'
Minimum level to log. Available levels are: CRITICAL, ERROR, WARNING, INFO, DEBUG.

LOG_STDOUT

Default: False
If True, all standard output (and error) of your process will be redirected to the log. For example if you print 'hello' it will appear in the Scrapy log.

MEMDEBUG_ENABLED

Default: False
Whether to enable memory debugging.

MEMDEBUG_NOTIFY

Default: []
When memory debugging is enabled a memory report will be sent to the specified addresses if this setting is not empty, otherwise the report will be written to the log.
Example:
MEMDEBUG_NOTIFY = ['user@example.com']

MEMUSAGE_ENABLED

Default: False
Scope: scrapy.contrib.memusage
Whether to enable the memory usage extension that will shutdown the Scrapy process when it exceeds a memory limit, and also notify by email when that happened.

MEMUSAGE_LIMIT_MB

Default: 0
Scope: scrapy.contrib.memusage
The maximum amount of memory to allow (in megabytes) before shutting down Scrapy (if MEMUSAGE_ENABLED is True). If zero, no check will be performed.

MEMUSAGE_NOTIFY_MAIL

Default: False
Scope: scrapy.contrib.memusage
A list of emails to notify if the memory limit has been reached.
Example:
MEMUSAGE_NOTIFY_MAIL = ['user@example.com']

MEMUSAGE_REPORT

Default: False
Scope: scrapy.contrib.memusage
Whether to send a memory usage report after each spider has been closed.

MEMUSAGE_WARNING_MB

Default: 0
Scope: scrapy.contrib.memusage
The maximum amount of memory to allow (in megabytes) before sending a warning email notifying about it. If zero, no warning will be produced.

NEWSPIDER_MODULE

Default: ''
Module where to create new spiders using the genspider command.
Example:
NEWSPIDER_MODULE = 'mybot.spiders_dev'

RANDOMIZE_DOWNLOAD_DELAY

Default: True
If enabled, Scrapy will wait a random amount of time (between 0.5 and 1.5 * DOWNLOAD_DELAY) while fetching requests from the same website.
This randomization decreases the chance of the crawler being detected (and subsequently blocked) by sites which analyze requests looking for statistically significant similarities in the time between their requests.
The randomization policy is the same used by wget --random-wait option.
If DOWNLOAD_DELAY is zero (default) this option has no effect.

REDIRECT_MAX_TIMES

Default: 20
Defines the maximum times a request can be redirected. After this maximum the request’s response is returned as is. We used Firefox default value for the same task.

REDIRECT_MAX_METAREFRESH_DELAY

Default: 100
Some sites use meta-refresh for redirecting to a session expired page, so we restrict automatic redirection to a maximum delay (in seconds)

REDIRECT_PRIORITY_ADJUST

Default: +2
Adjust redirect request priority relative to original request. A negative priority adjust means more priority.

ROBOTSTXT_OBEY

Default: False
Scope: scrapy.contrib.downloadermiddleware.robotstxt
If enabled, Scrapy will respect robots.txt policies. For more information see RobotsTxtMiddleware

SCHEDULER

Default: 'scrapy.core.scheduler.Scheduler'
The scheduler to use for crawling.

SPIDER_CONTRACTS

Default:: {}
A dict containing the scrapy contracts enabled in your project, used for testing spiders. For more info see Spiders Contracts.

SPIDER_CONTRACTS_BASE

Default:
{
    'scrapy.contracts.default.UrlContract' : 1,
    'scrapy.contracts.default.ReturnsContract': 2,
    'scrapy.contracts.default.ScrapesContract': 3,
}
A dict containing the scrapy contracts enabled by default in Scrapy. You should never modify this setting in your project, modify SPIDER_CONTRACTS instead. For more info see Spiders Contracts.

SPIDER_MIDDLEWARES

Default:: {}
A dict containing the spider middlewares enabled in your project, and their orders. For more info see Activating a spider middleware.

SPIDER_MIDDLEWARES_BASE

Default:
{
    'scrapy.contrib.spidermiddleware.httperror.HttpErrorMiddleware': 50,
    'scrapy.contrib.spidermiddleware.offsite.OffsiteMiddleware': 500,
    'scrapy.contrib.spidermiddleware.referer.RefererMiddleware': 700,
    'scrapy.contrib.spidermiddleware.urllength.UrlLengthMiddleware': 800,
    'scrapy.contrib.spidermiddleware.depth.DepthMiddleware': 900,
}
A dict containing the spider middlewares enabled by default in Scrapy. You should never modify this setting in your project, modify SPIDER_MIDDLEWARES instead. For more info see Activating a spider middleware.

SPIDER_MODULES

Default: []
A list of modules where Scrapy will look for spiders.
Example:
SPIDER_MODULES = ['mybot.spiders_prod', 'mybot.spiders_dev']

STATS_CLASS

Default: 'scrapy.statscol.MemoryStatsCollector'
The class to use for collecting stats, who must implement the Stats Collector API.

STATS_DUMP

Default: True
Dump the Scrapy stats (to the Scrapy log) once the spider finishes.
For more info see: Stats Collection.

STATSMAILER_RCPTS

Default: [] (empty list)
Send Scrapy stats after spiders finish scraping. See StatsMailer for more info.

TELNETCONSOLE_ENABLED

Default: True
A boolean which specifies if the telnet console will be enabled (provided its extension is also enabled).

TELNETCONSOLE_PORT

Default: [6023, 6073]
The port range to use for the telnet console. If set to None or 0, a dynamically assigned port is used. For more info see Telnet Console.

TEMPLATES_DIR

Default: templates dir inside scrapy module
The directory where to look for templates when creating new projects with startproject command.

URLLENGTH_LIMIT

Default: 2083
Scope: contrib.spidermiddleware.urllength
The maximum URL length to allow for crawled URLs. For more information about the default value for this setting see: http://www.boutell.com/newfaq/misc/urllength.html

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