24 KiB
Settings
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.. module:: scrapy.conf :synopsis: Settings manager
The Scrapy settings allows you to customize the behaviour of all Scrapy components, including the core, extensions, pipelines and spiders themselves.
The settings infrastructure provides a global namespace of key-value mappings where the code can pull configuration values from. The settings can be populated through different mechanisms, which are described below.
Read :ref:`topics-settings-ref` for all supported entries.
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Settings can be populated using different mechanisms, each of which having a different precedence. Here is the list of them in decreasing order of precedence:
- Global overrides (most precedence)
- Environment variables
- scrapy_settings
- Default settings per-command
- Default global settings (less precedence)
This mechanisms are described with more detail below.
1. Global overrides
Global overrides are the ones that takes most precedence, and are usually populated by command line options.
- Example::
>>> from scrapy.conf import settings >>> settings.overrides['LOG_ENABLED'] = True
You can also override one (or more) settings from command line using the --set command line argument.
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.. highlight:: sh
Example:
scrapy-ctl.py crawl domain.com --set LOG_FILE=scrapy.log
2. Environment variables
You can populate settings using environment variables prefixed with SCRAPY_. For example, to change the log file location un Unix systems:
$ export SCRAPY_LOG_FILE=scrapy.log $ scrapy-ctl.py crawl example.com
In Windows systems, you can change the environment variables from the Control Panel following these guidelines.
3. scrapy_settings
scrapy_settings is the standard configuration file for your Scrapy project. It's where most of your custom settings will be populated.
4. Default settings per-command
Each scrapy-ctl command can have its own default settings, which override the global default settings. Those custom command settings are located inside the scrapy.conf.commands module, or you can specify custom settings to override per-comand inside your project, by writing them in the module referenced by the :setting:`COMMANDS_SETTINGS_MODULE` setting. Those settings will take more
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The global defaults are located in scrapy.conf.default_settings and documented in the :ref:`topics-settings-ref` section.
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.. highlight:: python
Here's an example of the simplest way to access settings from Python code:
>>> from scrapy.conf import settings >>> print settings['LOG_ENABLED'] True
In other words, settings can be accesed like a dict, but it's usually preferred to extract the setting in the format you need it to avoid type errors. In order to do that you'll have to use one of the following methods:
The Settings object is automatically instantiated when the :mod:`scrapy.conf` module is loaded, and it's usually accessed like this:
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.. method:: Settings.get(name, default=None) Get a setting value without affecting its original type. ``name`` is a string with the setting name ``default`` is the value to return if no setting is found
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.. method:: Settings.getbool(name, deafult=Flse) Get a setting value as a boolean. For example, both ``1`` and ``'1'``, and ``True`` return ``True``, while ``0``, ``'0'``, ``False`` and ``None`` return ``False```` For example, settings populated through environment variables set to ``'0'`` will return ``False`` when using this method. ``name`` is a string with the setting name ``default`` is the value to return if no setting is found
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.. method:: Settings.getint(name, default=0) Get a setting value as an int ``name`` is a string with the setting name ``default`` is the value to return if no setting is found
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.. method:: Settings.getfloat(name, default=0.0) Get a setting value as a float ``name`` is a string with the setting name ``default`` is the value to return if no setting is found
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.. method:: Settings.getlist(name, default=None) Get a setting value as a list. If the setting original type is a list it will be returned verbatim. If it's a string it will be splitted by ",". For example, settings populated through environment variables set to ``'one,two'`` will return a list ['one', 'two'] when using this method. ``name`` is a string with the setting name ``default`` is the value to return if no setting is found
Rationale for setting names
Setting names are usually prefixed with the component that they configure. For example, proper setting names for a fictional robots.txt extension would be ROBOTSTXT_ENABLED, ROBOTSTXT_OBEY, ROBOTSTXT_CACHEDIR, etc.
Built-in settings reference
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.
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.. setting:: BOT_NAME
BOT_NAME
Default: scrapybot
The name of the bot implemented by this Scrapy project. This will be used to construct the User-Agent by default, and also for logging.
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.. setting:: BOT_VERSION
BOT_VERSION
Default: 1.0
The version of the bot implemented by this Scrapy project. This will be used to construct the User-Agent by default.
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.. setting:: HTTPCACHE_DIR
HTTPCACHE_DIR
Default: '' (empty string)
The directory to use for storing the (low-level) HTTP cache. If empty the HTTP cache will be disabled.
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.. setting:: HTTPCACHE_EXPIRATION_SECS
HTTPCACHE_EXPIRATION_SECS
Default: 0
Number of seconds to use for HTTP cache expiration. Requests that were cached before this time will be re-downloaded. If zero, cached requests will always expire. Negative numbers means requests will never expire.
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.. setting:: HTTPCACHE_IGNORE_MISSING
HTTPCACHE_IGNORE_MISSING
Default: False
If enabled, requests not found in the cache will be ignored instead of downloaded.
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.. setting:: HTTPCACHE_SECTORIZE
HTTPCACHE_SECTORIZE
Default: True
Whether to split HTTP cache storage in several dirs for performance.
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.. setting:: COMMANDS_MODULE
COMMANDS_MODULE
Default: '' (empty string)
A module to use for looking for custom Scrapy commands. This is used to add custom command for your Scrapy project.
Example:
COMMANDS_MODULE = 'mybot.commands'
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.. setting:: COMMANDS_SETTINGS_MODULE
COMMANDS_SETTINGS_MODULE
Default: '' (empty string)
A module to use for looking for custom Scrapy command settings.
Example:
COMMANDS_SETTINGS_MODULE = 'mybot.conf.commands'
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.. setting:: CONCURRENT_DOMAINS
CONCURRENT_DOMAINS
Default: 8
Maximum number of domains to scrape in parallel.
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.. setting:: CONCURRENT_ITEMS
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).
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.. setting:: COOKIES_DEBUG
DEFAULT_ITEM_CLASS
Default: 'scrapy.item.Item'
The default class that will be used for instantiating items in the :ref:`the Scrapy shell <topics-shell>`.
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.. setting:: DEFAULT_REQUEST_HEADERS
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 :class:`~scrapy.contrib.downloadermiddleware.defaultheaders.DefaultHeadersMiddleware`.
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.. setting:: DEFAULT_SPIDER
DEFAULT_SPIDER
Default: None
The default spider class that will be instantiated for URLs for which no specific spider is found. This class must have a constructor which receives as only parameter the domain name of the given URL.
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.. setting:: DEPTH_LIMIT
DEPTH_LIMIT
Default: 0
The maximum depth that will be allowed to crawl for any site. If zero, no limit will be imposed.
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.. setting:: DEPTH_STATS
DEPTH_STATS
Default: True
Whether to collect depth stats.
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.. setting:: DOMAIN_SCHEDULER
DOMAIN_SCHEDULER
Default: 'scrapy.contrib.domainsch.FifoDomainScheduler'
The Domain Scheduler to use. The domain scheduler returns the next domain (spider) to scrape.
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.. setting:: DOWNLOADER_DEBUG
DOWNLOADER_DEBUG
Default: False
Whether to enable the Downloader debugging mode.
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.. setting:: DOWNLOADER_MIDDLEWARES
DOWNLOADER_MIDDLEWARES
Default:: {}
A dict containing the downloader middlewares enabled in your project, and their orders. For more info see :ref:`topics-downloader-middleware-setting`.
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.. setting:: DOWNLOADER_MIDDLEWARES_BASE
DOWNLOADER_MIDDLEWARES_BASE
Default:
{
'scrapy.contrib.downloadermiddleware.robotstxt.RobotsTxtMiddleware': 100,
'scrapy.contrib.downloadermiddleware.httpauth.HttpAuthMiddleware': 300,
'scrapy.contrib.downloadermiddleware.useragent.UserAgentMiddleware': 400,
'scrapy.contrib.downloadermiddleware.retry.RetryMiddleware': 500,
'scrapy.contrib.downloadermiddleware.defaultheaders.DefaultHeadersMiddleware': 550,
'scrapy.contrib.downloadermiddleware.redirect.RedirectMiddleware': 600,
'scrapy.contrib.downloadermiddleware.cookies.CookiesMiddleware': 700,
'scrapy.contrib.downloadermiddleware.httpcompression.HttpCompressionMiddleware': 800,
'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 :setting:`DOWNLOADER_MIDDLEWARES` instead. For more info see :ref:`topics-downloader-middleware-setting`.
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.. setting:: DOWNLOADER_STATS
DOWNLOADER_STATS
Default: True
Whether to enable downloader stats collection.
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.. setting:: DOWNLOAD_DELAY
DOWNLOAD_DELAY
Default: 0
The amount of time (in secs) that the downloader should wait before downloading consecutive pages from the same spider. 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
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.. setting:: DOWNLOAD_TIMEOUT
DOWNLOAD_TIMEOUT
Default: 180
The amount of time (in secs) that the downloader will wait before timing out.
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.. setting:: DUPEFILTER_CLASS
DUPEFILTER_CLASS
Default: 'scrapy.contrib.dupefilter.RequestFingerprintDupeFilter'
The class used to detect and filter duplicate requests.
The default (RequestFingerprintDupeFilter) filters based on request fingerprint (using scrapy.utils.request.request_fingerprint) and grouping per domain.
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.. setting:: EXTENSIONS
EXTENSIONS
Default:: {}
A dict containing the extensions enabled in your project, and their orders.
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.. setting:: EXTENSIONS_BASE
EXTENSIONS_BASE
Default:
{
'scrapy.stats.corestats.CoreStats': 0,
'scrapy.management.web.WebConsole': 0,
'scrapy.management.telnet.TelnetConsole': 0,
'scrapy.contrib.webconsole.scheduler.SchedulerQueue': 0,
'scrapy.contrib.webconsole.livestats.LiveStats': 0,
'scrapy.contrib.webconsole.spiderctl.Spiderctl': 0,
'scrapy.contrib.webconsole.enginestatus.EngineStatus': 0,
'scrapy.contrib.webconsole.stats.StatsDump': 0,
'scrapy.contrib.spider.reloader.SpiderReloader': 0,
'scrapy.contrib.memusage.MemoryUsage': 0,
'scrapy.contrib.memdebug.MemoryDebugger': 0,
'scrapy.contrib.closedomain.CloseDomain': 0,
'scrapy.contrib.debug.StackTraceDump': 0,
}
The list of available extensions. Keep in mind that some of them need need to be enabled through a setting. By default, this setting contains all stable built-in extensions.
For more information See the :ref:`extensions user guide <topics-extensions>` and the :ref:`list of available extensions <topics-extensions-ref>`.
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.. setting:: GROUPSETTINGS_ENABLED
GROUPSETTINGS_ENABLED
Default: False
Whether to enable group settings where spiders pull their settings from.
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.. setting:: GROUPSETTINGS_MODULE
GROUPSETTINGS_MODULE
Default: '' (empty string)
The module to use for pulling settings from, if the group settings is enabled.
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.. setting:: ITEM_PIPELINES
ITEM_PIPELINES
Default: []
The item pipelines to use (a list of classes).
Example:
ITEM_PIPELINES = [
'mybot.pipeline.validate.ValidateMyItem',
'mybot.pipeline.validate.StoreMyItem'
]
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.. setting:: LOG_ENABLED
LOG_ENABLED
Default: True
Enable logging.
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.. setting:: LOG_FILE
LOG_FILE
Default: None
File name to use for logging output. If None, standard input (or error) will be used depending on the value of the LOG_STDOUT setting.
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.. setting:: LOG_LEVEL
LOG_LEVEL
Default: 'DEBUG'
Minimum level to log. Available levels are: CRITICAL, ERROR, WARNING, INFO, DEBUG. For more info see :ref:`topics-logging`.
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.. setting:: LOG_STDOUT
LOG_STDOUT
Default: False
If enabled logging will be sent to standard output, otherwise standard error will be used.
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.. setting:: MAIL_FROM
MAIL_FROM
Default: 'scrapy@localhost'
Email to use as sender address for sending emails using the :ref:`Scrapy e-mail sending facility <topics-email>`.
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.. setting:: MAIL_HOST
MAIL_HOST
Default: 'localhost'
Host to use for sending emails using the :ref:`Scrapy e-mail sending facility <topics-email>`.
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.. setting:: MEMDEBUG_ENABLED
MEMDEBUG_ENABLED
Default: False
Whether to enable memory debugging.
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.. setting:: MEMDEBUG_NOTIFY
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']
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.. setting:: MEMUSAGE_ENABLED
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.
See :ref:`topics-extensions-ref-memusage`.
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.. setting:: MEMUSAGE_LIMIT_MB
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.
See :ref:`topics-extensions-ref-memusage`.
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.. setting:: MEMUSAGE_NOTIFY_MAIL
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']
See :ref:`topics-extensions-ref-memusage`.
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.. setting:: MEMUSAGE_REPORT
MEMUSAGE_REPORT
Default: False
Scope: scrapy.contrib.memusage
Whether to send a memory usage report after each domain has been closed.
See :ref:`topics-extensions-ref-memusage`.
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.. setting:: MEMUSAGE_WARNING_MB
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.
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.. setting:: MYSQL_CONNECTION_SETTINGS
MYSQL_CONNECTION_SETTINGS
Default: {}
Scope: scrapy.utils.db.mysql_connect
Settings to use for MySQL connections performed through scrapy.utils.db.mysql_connect
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.. setting:: NEWSPIDER_MODULE
NEWSPIDER_MODULE
Default: ''
Module where to create new spiders using the genspider command.
Example:
NEWSPIDER_MODULE = 'mybot.spiders_dev'
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.. setting:: PROJECT_NAME
PROJECT_NAME
Default: Not Defined
The name of the current project. It matches the project module name as created by startproject command, and is only defined by project settings file.
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.. setting:: REDIRECT_MAX_TIMES
REDIRECT_MAX_TIMES
Default: 20
Defines the maximun times a request can be redirected. After this maximun the request's response is returned as is. We used Firefox default value for the same task.
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.. setting:: REDIRECT_MAX_METAREFRESH_DELAY
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)
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.. setting:: REDIRECT_PRIORITY_ADJUST
REDIRECT_PRIORITY_ADJUST
Default: +2
Adjust redirect request priority relative to original request. A negative priority adjust means more priority.
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.. setting:: REQUESTS_PER_DOMAIN
REQUESTS_PER_DOMAIN
Default: 8
Specifies how many concurrent (ie. simultaneous) requests will be performed per open spider.
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.. setting:: REQUESTS_QUEUE_SIZE
REQUESTS_QUEUE_SIZE
Default: 0
Scope: scrapy.contrib.spidermiddleware.limit
If non zero, it will be used as an upper limit for the amount of requests that can be scheduled per domain.
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.. setting:: ROBOTSTXT_OBEY
ROBOTSTXT_OBEY
Default: False
Scope: scrapy.contrib.downloadermiddleware.robotstxt
If enabled, Scrapy will respect robots.txt policies. For more information see :ref:`topics-dlmw-robots`
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.. setting:: SCHEDULER
SCHEDULER
Default: 'scrapy.core.scheduler.Scheduler'
The scheduler to use for crawling.
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.. setting:: SCHEDULER_ORDER
SCHEDULER_ORDER
Default: 'BFO'
Scope: scrapy.core.scheduler
The order to use for the crawling scheduler. Available orders are:
- 'BFO': Breadth-first order - typically consumes more memory but reaches most relevant pages earlier.
- 'DFO': Depth-first order - typically consumes less memory than but takes longer to reach most relevant pages.
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.. setting:: SCHEDULER_MIDDLEWARES
SCHEDULER_MIDDLEWARES
Default:: {}
A dict containing the scheduler middlewares enabled in your project, and their orders.
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.. setting:: SCHEDULER_MIDDLEWARES_BASE
SCHEDULER_MIDDLEWARES_BASE
Default:
SCHEDULER_MIDDLEWARES_BASE = {
'scrapy.contrib.schedulermiddleware.duplicatesfilter.DuplicatesFilterMiddleware': 500,
}
A dict containing the scheduler middlewares enabled by default in Scrapy. You should never modify this setting in your project, modify :setting:`SCHEDULER_MIDDLEWARES` instead.
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.. setting:: SPIDERPROFILER_ENABLED
SPIDERPROFILER_ENABLED
Default: False
Enable the spider profiler. Warning: this could have a big impact in performance.
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.. setting:: SPIDER_MIDDLEWARES
SPIDER_MIDDLEWARES
Default:: {}
A dict containing the spider middlewares enabled in your project, and their orders. For more info see :ref:`topics-spider-middleware-setting`.
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.. setting:: SPIDER_MIDDLEWARES_BASE
SPIDER_MIDDLEWARES_BASE
Default:
{
'scrapy.contrib.spidermiddleware.httperror.HttpErrorMiddleware': 50,
'scrapy.contrib.itemsampler.ItemSamplerMiddleware': 100,
'scrapy.contrib.spidermiddleware.requestlimit.RequestLimitMiddleware': 200,
'scrapy.contrib.spidermiddleware.restrict.RestrictMiddleware': 300,
'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 :setting:`SPIDER_MIDDLEWARES` instead. For more info see :ref:`topics-spider-middleware-setting`.
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.. setting:: SPIDER_MODULES
SPIDER_MODULES
Default: []
A list of modules where Scrapy will look for spiders.
Example:
SPIDER_MODULES = ['mybot.spiders_prod', 'mybot.spiders_dev']
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.. setting:: STATS_CLASS
STATS_CLASS
Default: 'scrapy.stats.collector.MemoryStatsCollector'
The class to use for collecting stats (must implement the Stats Collector API, or subclass the StatsCollector class).
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.. setting:: STATS_DUMP
STATS_DUMP
Default: False
Dump (to log) domain-specific stats collected when a domain is closed, and all global stats when the Scrapy process finishes (ie. when the engine is shutdown).
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.. setting:: STATS_ENABLED
STATS_ENABLED
Default: True
Enable stats collection.
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.. setting:: STATSMAILER_RCPTS
STATSMAILER_RCPTS
Default: [] (empty list)
Send Scrapy stats after domains finish scrapy. See :class:`~scrapy.contrib.statsmailer.StatsMailer` for more info.
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.. setting:: TELNETCONSOLE_ENABLED
TELNETCONSOLE_ENABLED
Default: True
Scope: scrapy.management.telnet
A boolean which specifies if the telnet management console will be enabled (provided its extension is also enabled).
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.. setting:: TELNETCONSOLE_PORT
TELNETCONSOLE_PORT
Default: 6023
The port to use for the telnet console. If set to None or 0, a dynamically assigned port is used. For more info see :ref:`topics-telnetconsole`.
System Message: ERROR/3 (<stdin>, line 943); backlink
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.. setting:: TEMPLATES_DIR
TEMPLATES_DIR
Default: templates dir inside scrapy module
The directory where to look for template when creating new projects with scrapy-admin.py newproject.
System Message: ERROR/3 (<stdin>, line 957)
Unknown directive type "setting".
.. setting:: URLLENGTH_LIMIT
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
System Message: ERROR/3 (<stdin>, line 969)
Unknown directive type "setting".
.. setting:: USER_AGENT
USER_AGENT
Default: "%s/%s" % (BOT_NAME, BOT_VERSION)
The default User-Agent to use when crawling, unless overrided.
System Message: ERROR/3 (<stdin>, line 978)
Unknown directive type "setting".
.. setting:: WEBCONSOLE_ENABLED
WEBCONSOLE_ENABLED
Default: True
A boolean which specifies if the web management console will be enabled (provided its extension is also enabled).
System Message: ERROR/3 (<stdin>, line 988)
Unknown directive type "setting".
.. setting:: WEBCONSOLE_LOGFILE
WEBCONSOLE_LOGFILE
Default: None
A file to use for logging HTTP requests made to the web console. If unset web the log is sent to standard scrapy log.
System Message: ERROR/3 (<stdin>, line 998)
Unknown directive type "setting".
.. setting:: WEBCONSOLE_PORT
WEBCONSOLE_PORT
Default: 6080
The port to use for the web console. If set to None or 0, a dynamically assigned port is used. For more info see :ref:`topics-webconsole`.
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