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Settings

The Scrapy settings allows you to customize the behaviour of all Scrapy components, including the core, extensions, pipelines and spiders themselves.

The infrastructure of the settings provides a global namespace of key-value mappings that the code can use to pull configuration values from. The settings can be populated through different mechanisms, which are described below.

The settings are also the mechanism for selecting the currently active Scrapy project (in case you have many).

For a list of available built-in settings see: :ref:`topics-settings-ref`.

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Designating the settings

When you use Scrapy, you have to tell it which settings you're using. You can do this by using an environment variable, SCRAPY_SETTINGS_MODULE.

The value of SCRAPY_SETTINGS_MODULE should be in Python path syntax, e.g. myproject.settings. Note that the settings module should be on the Python import search path.

Populating the settings

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:

Command line options (most precedence)

Settings per-spider

Project settings module

Default settings per-command

Default global settings (less precedence)

The population of these settings sources is taken care of internally, but a manual handling is possible using API calls. See the :ref:`topics-api-settings` topic for reference.

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These mechanisms are described in more detail below.

1. Command line options

Arguments provided by the command line are the ones that take most precedence, overriding any other options. You can explicitly override one (or more) settings using the -s (or --set) command line option.

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.. highlight:: sh

Example:

scrapy crawl myspider -s LOG_FILE=scrapy.log

2. Settings per-spider

Spiders (See the :ref:`topics-spiders` chapter for reference) can define their own settings that will take precedence and override the project ones. They can do so by setting their :attr:`~scrapy.spiders.Spider.custom_settings` attribute:

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class MySpider(scrapy.Spider):
    name = 'myspider'

    custom_settings = {
        'SOME_SETTING': 'some value',
    }

3. Project settings module

The project settings module is the standard configuration file for your Scrapy project, it's where most of your custom settings will be populated. For a standard Scrapy project, this means you'll be adding or changing the settings in the settings.py file created for your project.

4. Default settings per-command

Each :doc:`Scrapy tool </topics/commands>` command can have its own default settings, which override the global default settings. Those custom command settings are specified in the default_settings attribute of the command class.

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5. Default global settings

The global defaults are located in the scrapy.settings.default_settings module and documented in the :ref:`topics-settings-ref` section.

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How to access settings

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.. highlight:: python

In a spider, the settings are available through self.settings:

class MySpider(scrapy.Spider):
    name = 'myspider'
    start_urls = ['http://example.com']

    def parse(self, response):
        print("Existing settings: %s" % self.settings.attributes.keys())

Note

The settings attribute is set in the base Spider class after the spider is initialized. If you want to use the settings before the initialization (e.g., in your spider's __init__() method), you'll need to override the :meth:`~scrapy.spiders.Spider.from_crawler` method.

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Settings can be accessed through the :attr:`scrapy.crawler.Crawler.settings` attribute of the Crawler that is passed to from_crawler method in extensions, middlewares and item pipelines:

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class MyExtension(object):
    def __init__(self, log_is_enabled=False):
        if log_is_enabled:
            print("log is enabled!")

    @classmethod
    def from_crawler(cls, crawler):
        settings = crawler.settings
        return cls(settings.getbool('LOG_ENABLED'))

The settings object can be used like a dict (e.g., settings['LOG_ENABLED']), but it's usually preferred to extract the setting in the format you need it to avoid type errors, using one of the methods provided by the :class:`~scrapy.settings.Settings` API.

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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:: AWS_ACCESS_KEY_ID

AWS_ACCESS_KEY_ID

Default: None

The AWS access key used by code that requires access to Amazon Web services, such as the :ref:`S3 feed storage backend <topics-feed-storage-s3>`.

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.. setting:: AWS_SECRET_ACCESS_KEY

AWS_SECRET_ACCESS_KEY

Default: None

The AWS secret key used by code that requires access to Amazon Web services, such as the :ref:`S3 feed storage backend <topics-feed-storage-s3>`.

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.. setting:: BOT_NAME

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 :command:`startproject` command.

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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 :ref:`Item Pipeline <topics-item-pipeline>`).

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.. setting:: CONCURRENT_REQUESTS

CONCURRENT_REQUESTS

Default: 16

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

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.. setting:: CONCURRENT_REQUESTS_PER_DOMAIN

CONCURRENT_REQUESTS_PER_DOMAIN

Default: 8

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

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.. setting:: CONCURRENT_REQUESTS_PER_IP

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 :setting:`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.

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This setting also affects :setting:`DOWNLOAD_DELAY` and :ref:`topics-autothrottle`: if :setting:`CONCURRENT_REQUESTS_PER_IP` is non-zero, download delay is enforced per IP, not per domain.

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.. setting:: DEFAULT_ITEM_CLASS

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.downloadermiddlewares.defaultheaders.DefaultHeadersMiddleware`.

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.. setting:: DEPTH_LIMIT

DEPTH_LIMIT

Default: 0

Scope: scrapy.spidermiddlewares.depth.DepthMiddleware

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_PRIORITY

DEPTH_PRIORITY

Default: 0

Scope: scrapy.spidermiddlewares.depth.DepthMiddleware

An integer that is used to adjust the request priority based on its depth:

if zero (default), no priority adjustment is made from depth
a positive value will decrease the priority, i.e. higher depth requests will be processed later ; this is commonly used when doing breadth-first crawls (BFO)
a negative value will increase priority, i.e., higher depth requests will be processed sooner (DFO)

See also: :ref:`faq-bfo-dfo` about tuning Scrapy for BFO or DFO.

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Note

This setting adjusts priority in the opposite way compared to other priority settings :setting:`REDIRECT_PRIORITY_ADJUST` and :setting:`RETRY_PRIORITY_ADJUST`.

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.. setting:: DEPTH_STATS

DEPTH_STATS

Default: True

Scope: scrapy.spidermiddlewares.depth.DepthMiddleware

Whether to collect maximum depth stats.

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.. setting:: DEPTH_STATS_VERBOSE

DEPTH_STATS_VERBOSE

Default: False

Scope: scrapy.spidermiddlewares.depth.DepthMiddleware

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

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.. setting:: DNSCACHE_ENABLED

DNSCACHE_ENABLED

Default: True

Whether to enable DNS in-memory cache.

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.. setting:: DNSCACHE_SIZE

DNSCACHE_SIZE

Default: 10000

DNS in-memory cache size.

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.. setting:: DNS_TIMEOUT

DNS_TIMEOUT

Default: 60

Timeout for processing of DNS queries in seconds. Float is supported.

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.. setting:: DOWNLOADER

DOWNLOADER

Default: 'scrapy.core.downloader.Downloader'

The downloader to use for crawling.

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.. setting:: DOWNLOADER_HTTPCLIENTFACTORY

DOWNLOADER_HTTPCLIENTFACTORY

Default: 'scrapy.core.downloader.webclient.ScrapyHTTPClientFactory'

Defines a Twisted protocol.ClientFactory class to use for HTTP/1.0 connections (for HTTP10DownloadHandler).

Note

HTTP/1.0 is rarely used nowadays so you can safely ignore this setting, unless you use Twisted<11.1, or if you really want to use HTTP/1.0 and override :setting:`DOWNLOAD_HANDLERS_BASE` for http(s) scheme accordingly, i.e. to 'scrapy.core.downloader.handlers.http.HTTP10DownloadHandler'.

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.. setting:: DOWNLOADER_CLIENTCONTEXTFACTORY

DOWNLOADER_CLIENTCONTEXTFACTORY

Default: 'scrapy.core.downloader.contextfactory.ScrapyClientContextFactory'

Represents the classpath to the ContextFactory to use.

Here, "ContextFactory" is a Twisted term for SSL/TLS contexts, defining the TLS/SSL protocol version to use, whether to do certificate verification, or even enable client-side authentication (and various other things).

Note

Scrapy default context factory does NOT perform remote server certificate verification. This is usually fine for web scraping.

If you do need remote server certificate verification enabled, Scrapy also has another context factory class that you can set, 'scrapy.core.downloader.contextfactory.BrowserLikeContextFactory', which uses the platform's certificates to validate remote endpoints. This is only available if you use Twisted>=14.0.

If you do use a custom ContextFactory, make sure it accepts a method parameter at init (this is the OpenSSL.SSL method mapping :setting:`DOWNLOADER_CLIENT_TLS_METHOD`).

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.. setting:: DOWNLOADER_CLIENT_TLS_METHOD

DOWNLOADER_CLIENT_TLS_METHOD

Default: 'TLS'

Use this setting to customize the TLS/SSL method used by the default HTTP/1.1 downloader.

This setting must be one of these string values:

'TLS': maps to OpenSSL's TLS_method() (a.k.a SSLv23_method()), which allows protocol negotiation, starting from the highest supported by the platform; default, recommended
'TLSv1.0': this value forces HTTPS connections to use TLS version 1.0 ; set this if you want the behavior of Scrapy<1.1
'TLSv1.1': forces TLS version 1.1
'TLSv1.2': forces TLS version 1.2
'SSLv3': forces SSL version 3 (not recommended)

Note

We recommend that you use PyOpenSSL>=0.13 and Twisted>=0.13 or above (Twisted>=14.0 if you can).

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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.downloadermiddlewares.robotstxt.RobotsTxtMiddleware': 100,
    'scrapy.downloadermiddlewares.httpauth.HttpAuthMiddleware': 300,
    'scrapy.downloadermiddlewares.downloadtimeout.DownloadTimeoutMiddleware': 350,
    'scrapy.downloadermiddlewares.defaultheaders.DefaultHeadersMiddleware': 400,
    'scrapy.downloadermiddlewares.useragent.UserAgentMiddleware': 500,
    'scrapy.downloadermiddlewares.retry.RetryMiddleware': 550,
    'scrapy.downloadermiddlewares.ajaxcrawl.AjaxCrawlMiddleware': 560,
    'scrapy.downloadermiddlewares.redirect.MetaRefreshMiddleware': 580,
    'scrapy.downloadermiddlewares.httpcompression.HttpCompressionMiddleware': 590,
    'scrapy.downloadermiddlewares.redirect.RedirectMiddleware': 600,
    'scrapy.downloadermiddlewares.cookies.CookiesMiddleware': 700,
    'scrapy.downloadermiddlewares.httpproxy.HttpProxyMiddleware': 750,
    'scrapy.downloadermiddlewares.stats.DownloaderStats': 850,
    'scrapy.downloadermiddlewares.httpcache.HttpCacheMiddleware': 900,
}

A dict containing the downloader middlewares enabled by default in Scrapy. Low orders are closer to the engine, high orders are closer to the downloader. 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 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 :setting:`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 * :setting:`DOWNLOAD_DELAY` and 1.5 * :setting:`DOWNLOAD_DELAY`.

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When :setting:`CONCURRENT_REQUESTS_PER_IP` is non-zero, delays are enforced per ip address instead of per domain.

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You can also change this setting per spider by setting download_delay spider attribute.

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.. setting:: DOWNLOAD_HANDLERS

DOWNLOAD_HANDLERS

Default: {}

A dict containing the request downloader handlers enabled in your project. See :setting:`DOWNLOAD_HANDLERS_BASE` for example format.

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.. setting:: DOWNLOAD_HANDLERS_BASE

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',
    'ftp': 'scrapy.core.downloader.handlers.ftp.FTPDownloadHandler',
}

A dict containing the request download handlers enabled by default in Scrapy. You should never modify this setting in your project, modify :setting:`DOWNLOAD_HANDLERS` instead.

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You can disable any of these download handlers by assigning None to their URI scheme in :setting:`DOWNLOAD_HANDLERS`. E.g., to disable the built-in FTP handler (without replacement), place this in your settings.py:

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DOWNLOAD_HANDLERS = {
    'ftp': None,
}

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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.

Note

This timeout can be set per spider using :attr:`download_timeout` spider attribute and per-request using :reqmeta:`download_timeout` Request.meta key.

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.. setting:: DOWNLOAD_MAXSIZE

DOWNLOAD_MAXSIZE

Default: 1073741824 (1024MB)

The maximum response size (in bytes) that downloader will download.

If you want to disable it set to 0.

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.. reqmeta:: download_maxsize

Note

This size can be set per spider using :attr:`download_maxsize` spider attribute and per-request using :reqmeta:`download_maxsize` Request.meta key.

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This feature needs Twisted >= 11.1.

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.. setting:: DOWNLOAD_WARNSIZE

DOWNLOAD_WARNSIZE

Default: 33554432 (32MB)

The response size (in bytes) that downloader will start to warn.

If you want to disable it set to 0.

Note

This size can be set per spider using :attr:`download_warnsize` spider attribute and per-request using :reqmeta:`download_warnsize` Request.meta key.

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This feature needs Twisted >= 11.1.

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.. setting:: DUPEFILTER_CLASS

DUPEFILTER_CLASS

Default: 'scrapy.dupefilters.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. In order to change the way duplicates are checked you could subclass RFPDupeFilter and override its request_fingerprint method. This method should accept scrapy :class:`~scrapy.http.Request` object and return its fingerprint (a string).

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.. setting:: DUPEFILTER_DEBUG

DUPEFILTER_DEBUG

Default: False

By default, RFPDupeFilter only logs the first duplicate request. Setting :setting:`DUPEFILTER_DEBUG` to True will make it log all duplicate requests.

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.. setting:: EDITOR

EDITOR

Default: depends on the environment

The editor to use for editing spiders with the :command:`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).

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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.extensions.corestats.CoreStats': 0,
    'scrapy.extensions.telnet.TelnetConsole': 0,
    'scrapy.extensions.memusage.MemoryUsage': 0,
    'scrapy.extensions.memdebug.MemoryDebugger': 0,
    'scrapy.extensions.closespider.CloseSpider': 0,
    'scrapy.extensions.feedexport.FeedExporter': 0,
    'scrapy.extensions.logstats.LogStats': 0,
    'scrapy.extensions.spiderstate.SpiderState': 0,
    'scrapy.extensions.throttle.AutoThrottle': 0,
}

A dict containing the extensions available by default in Scrapy, and their orders. This setting contains all stable built-in extensions. Keep in mind that some of them need to be enabled through a setting.

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:: FEED_TEMPDIR

FEED_TEMPDIR

The Feed Temp dir allows you to set a custom folder to save crawler temporary files before uploading with :ref:`FTP feed storage <topics-feed-storage-ftp>` and :ref:`Amazon S3 <topics-feed-storage-s3>`.

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.. setting:: ITEM_PIPELINES

ITEM_PIPELINES

Default: {}

A dict containing the item pipelines to use, and their orders. Order values are arbitrary, but it is customary to define them in the 0-1000 range. Lower orders process before higher orders.

Example:

ITEM_PIPELINES = {
    'mybot.pipelines.validate.ValidateMyItem': 300,
    'mybot.pipelines.validate.StoreMyItem': 800,
}

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.. setting:: ITEM_PIPELINES_BASE

ITEM_PIPELINES_BASE

Default: {}

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

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.. setting:: LOG_ENABLED

LOG_ENABLED

Default: True

Whether to enable logging.

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.. setting:: LOG_ENCODING

LOG_ENCODING

Default: 'utf-8'

The encoding to use for logging.

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.. setting:: LOG_FILE

LOG_FILE

Default: None

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

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.. setting:: LOG_FORMAT

LOG_FORMAT

Default: '%(asctime)s [%(name)s] %(levelname)s: %(message)s'

String for formatting log messsages. Refer to the Python logging documentation for the whole list of available placeholders.

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.. setting:: LOG_DATEFORMAT

LOG_DATEFORMAT

Default: '%Y-%m-%d %H:%M:%S'

String for formatting date/time, expansion of the %(asctime)s placeholder in :setting:`LOG_FORMAT`. Refer to the Python datetime documentation for the whole list of available directives.

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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 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.

System Message: ERROR/3 (<stdin>, line 791)

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.. setting:: LOG_SHORT_NAMES

LOG_SHORT_NAMES

Default: False

If True, the logs will just contain the root path. If it is set to False then it displays the component responsible for the log output

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.. setting:: MEMDEBUG_ENABLED

MEMDEBUG_ENABLED

Default: False

Whether to enable memory debugging.

System Message: ERROR/3 (<stdin>, line 810)

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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']

System Message: ERROR/3 (<stdin>, line 825)

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.. setting:: MEMUSAGE_ENABLED

MEMUSAGE_ENABLED

Default: False

Scope: scrapy.extensions.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.extensions.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_CHECK_INTERVAL_SECONDS

MEMUSAGE_CHECK_INTERVAL_SECONDS

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Unknown directive type "versionadded".

.. versionadded:: 1.1

Default: 60.0

Scope: scrapy.extensions.memusage

The :ref:`Memory usage extension <topics-extensions-ref-memusage>` checks the current memory usage, versus the limits set by :setting:`MEMUSAGE_LIMIT_MB` and :setting:`MEMUSAGE_WARNING_MB`, at fixed time intervals.

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This sets the length of these intervals, in seconds.

See :ref:`topics-extensions-ref-memusage`.

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System Message: ERROR/3 (<stdin>, line 874)

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.. setting:: MEMUSAGE_NOTIFY_MAIL

MEMUSAGE_NOTIFY_MAIL

Default: False

Scope: scrapy.extensions.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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System Message: ERROR/3 (<stdin>, line 891)

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.. setting:: MEMUSAGE_REPORT

MEMUSAGE_REPORT

Default: False

Scope: scrapy.extensions.memusage

Whether to send a memory usage report after each spider has been closed.

See :ref:`topics-extensions-ref-memusage`.

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.. setting:: MEMUSAGE_WARNING_MB

MEMUSAGE_WARNING_MB

Default: 0

Scope: scrapy.extensions.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.

System Message: ERROR/3 (<stdin>, line 916)

Unknown directive type "setting".

.. setting:: NEWSPIDER_MODULE

NEWSPIDER_MODULE

Default: ''

Module where to create new spiders using the :command:`genspider` command.

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Example:

NEWSPIDER_MODULE = 'mybot.spiders_dev'

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.. setting:: RANDOMIZE_DOWNLOAD_DELAY

RANDOMIZE_DOWNLOAD_DELAY

Default: True

If enabled, Scrapy will wait a random amount of time (between 0.5 * :setting:`DOWNLOAD_DELAY` and 1.5 * :setting:`DOWNLOAD_DELAY`) while fetching requests from the same website.

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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 :setting:`DOWNLOAD_DELAY` is zero (default) this option has no effect.

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.. setting:: REACTOR_THREADPOOL_MAXSIZE

REACTOR_THREADPOOL_MAXSIZE

Default: 10

The maximum limit for Twisted Reactor thread pool size. This is common multi-purpose thread pool used by various Scrapy components. Threaded DNS Resolver, BlockingFeedStorage, S3FilesStore just to name a few. Increase this value if you're experiencing problems with insufficient blocking IO.

System Message: ERROR/3 (<stdin>, line 961)

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.. setting:: REDIRECT_MAX_TIMES

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.

System Message: ERROR/3 (<stdin>, line 972)

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.. setting:: REDIRECT_PRIORITY_ADJUST

REDIRECT_PRIORITY_ADJUST

Default: +2

Scope: scrapy.downloadermiddlewares.redirect.RedirectMiddleware

Adjust redirect request priority relative to original request:

a positive priority adjust (default) means higher priority.
a negative priority adjust means lower priority.

System Message: ERROR/3 (<stdin>, line 986)

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.. setting:: RETRY_PRIORITY_ADJUST

RETRY_PRIORITY_ADJUST

Default: -1

Scope: scrapy.downloadermiddlewares.retry.RetryMiddleware

Adjust retry request priority relative to original request:

a positive priority adjust means higher priority.
a negative priority adjust (default) means lower priority.

System Message: ERROR/3 (<stdin>, line 1000)

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.. setting:: ROBOTSTXT_OBEY

ROBOTSTXT_OBEY

Default: False

Scope: scrapy.downloadermiddlewares.robotstxt

If enabled, Scrapy will respect robots.txt policies. For more information see :ref:`topics-dlmw-robots`.

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Note

While the default value is False for historical reasons, this option is enabled by default in settings.py file generated by scrapy startproject command.

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.. setting:: SCHEDULER

SCHEDULER

Default: 'scrapy.core.scheduler.Scheduler'

The scheduler to use for crawling.

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.. setting:: SCHEDULER_DEBUG

SCHEDULER_DEBUG

Default: False

Setting to True will log debug information about the requests scheduler. This currently logs (only once) if the requests cannot be serialized to disk. Stats counter (scheduler/unserializable) tracks the number of times this happens.

Example entry in logs:

1956-01-31 00:00:00+0800 [scrapy.core.scheduler] ERROR: Unable to serialize request:
<GET http://example.com> - reason: cannot serialize <Request at 0x9a7c7ec>
(type Request)> - no more unserializable requests will be logged
(see 'scheduler/unserializable' stats counter)

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.. setting:: SCHEDULER_DISK_QUEUE

SCHEDULER_DISK_QUEUE

Default: 'scrapy.squeues.PickleLifoDiskQueue'

Type of disk queue that will be used by scheduler. Other available types are scrapy.squeues.PickleFifoDiskQueue, scrapy.squeues.MarshalFifoDiskQueue, scrapy.squeues.MarshalLifoDiskQueue.

System Message: ERROR/3 (<stdin>, line 1057)

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.. setting:: SCHEDULER_MEMORY_QUEUE

SCHEDULER_MEMORY_QUEUE

Default: 'scrapy.squeues.LifoMemoryQueue'

Type of in-memory queue used by scheduler. Other available type is: scrapy.squeues.FifoMemoryQueue.

System Message: ERROR/3 (<stdin>, line 1066)

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.. setting:: SCHEDULER_PRIORITY_QUEUE

SCHEDULER_PRIORITY_QUEUE

Default: 'queuelib.PriorityQueue'

Type of priority queue used by scheduler.

System Message: ERROR/3 (<stdin>, line 1074)

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.. setting:: SPIDER_CONTRACTS

SPIDER_CONTRACTS

Default:: {}

A dict containing the spider contracts enabled in your project, used for testing spiders. For more info see :ref:`topics-contracts`.

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.. setting:: SPIDER_CONTRACTS_BASE

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 :setting:`SPIDER_CONTRACTS` instead. For more info see :ref:`topics-contracts`.

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You can disable any of these contracts by assigning None to their class path in :setting:`SPIDER_CONTRACTS`. E.g., to disable the built-in ScrapesContract, place this in your settings.py:

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SPIDER_CONTRACTS = {
    'scrapy.contracts.default.ScrapesContract': None,
}

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.. setting:: SPIDER_LOADER_CLASS

SPIDER_LOADER_CLASS

Default: 'scrapy.spiderloader.SpiderLoader'

The class that will be used for loading spiders, which must implement the :ref:`topics-api-spiderloader`.

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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.spidermiddlewares.httperror.HttpErrorMiddleware': 50,
    'scrapy.spidermiddlewares.offsite.OffsiteMiddleware': 500,
    'scrapy.spidermiddlewares.referer.RefererMiddleware': 700,
    'scrapy.spidermiddlewares.urllength.UrlLengthMiddleware': 800,
    'scrapy.spidermiddlewares.depth.DepthMiddleware': 900,
}

A dict containing the spider middlewares enabled by default in Scrapy, and their orders. Low orders are closer to the engine, high orders are closer to the spider. 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']

System Message: ERROR/3 (<stdin>, line 1161)

Unknown directive type "setting".

.. setting:: STATS_CLASS

STATS_CLASS

Default: 'scrapy.statscollectors.MemoryStatsCollector'

The class to use for collecting stats, who must implement the :ref:`topics-api-stats`.

System Message: ERROR/3 (<stdin>, line 1168); backlink

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System Message: ERROR/3 (<stdin>, line 1171)

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.. setting:: STATS_DUMP

STATS_DUMP

Default: True

Dump the :ref:`Scrapy stats <topics-stats>` (to the Scrapy log) once the spider finishes.

System Message: ERROR/3 (<stdin>, line 1178); backlink

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For more info see: :ref:`topics-stats`.

System Message: ERROR/3 (<stdin>, line 1181); backlink

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System Message: ERROR/3 (<stdin>, line 1183)

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.. setting:: STATSMAILER_RCPTS

STATSMAILER_RCPTS

Default: [] (empty list)

Send Scrapy stats after spiders finish scraping. See :class:`~scrapy.extensions.statsmailer.StatsMailer` for more info.

System Message: ERROR/3 (<stdin>, line 1190); backlink

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.. setting:: TELNETCONSOLE_ENABLED

TELNETCONSOLE_ENABLED

Default: True

A boolean which specifies if the :ref:`telnet console <topics-telnetconsole>` will be enabled (provided its extension is also enabled).

System Message: ERROR/3 (<stdin>, line 1200); backlink

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System Message: ERROR/3 (<stdin>, line 1203)

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.. setting:: TELNETCONSOLE_PORT

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 :ref:`topics-telnetconsole`.

System Message: ERROR/3 (<stdin>, line 1210); backlink

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System Message: ERROR/3 (<stdin>, line 1214)

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.. setting:: TEMPLATES_DIR

TEMPLATES_DIR

Default: templates dir inside scrapy module

The directory where to look for templates when creating new projects with :command:`startproject` command and new spiders with :command:`genspider` command.

System Message: ERROR/3 (<stdin>, line 1221); backlink

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The project name must not conflict with the name of custom files or directories in the project subdirectory.

System Message: ERROR/3 (<stdin>, line 1229)

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.. setting:: URLLENGTH_LIMIT

URLLENGTH_LIMIT

Default: 2083

Scope: spidermiddlewares.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 1241)

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.. setting:: USER_AGENT

USER_AGENT

Default: "Scrapy/VERSION (+http://scrapy.org)"

The default User-Agent to use when crawling, unless overridden.

Settings documented elsewhere:

The following settings are documented elsewhere, please check each specific case to see how to enable and use them.

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.. settingslist::

</html>

34 KiB Raw Blame History

Settings

Designating the settings

Populating the settings

1. Command line options

2. Settings per-spider

3. Project settings module

4. Default settings per-command

5. Default global settings

How to access settings

Rationale for setting names

Built-in settings reference

AWS_ACCESS_KEY_ID

AWS_SECRET_ACCESS_KEY

BOT_NAME

CONCURRENT_ITEMS

CONCURRENT_REQUESTS

CONCURRENT_REQUESTS_PER_DOMAIN

CONCURRENT_REQUESTS_PER_IP

DEFAULT_ITEM_CLASS

DEFAULT_REQUEST_HEADERS

DEPTH_LIMIT

DEPTH_PRIORITY

DEPTH_STATS

DEPTH_STATS_VERBOSE

DNSCACHE_ENABLED

DNSCACHE_SIZE

DNS_TIMEOUT

DOWNLOADER

DOWNLOADER_HTTPCLIENTFACTORY

DOWNLOADER_CLIENTCONTEXTFACTORY

DOWNLOADER_CLIENT_TLS_METHOD

DOWNLOADER_MIDDLEWARES

DOWNLOADER_MIDDLEWARES_BASE

DOWNLOADER_STATS

DOWNLOAD_DELAY

DOWNLOAD_HANDLERS

DOWNLOAD_HANDLERS_BASE

DOWNLOAD_TIMEOUT

DOWNLOAD_MAXSIZE

DOWNLOAD_WARNSIZE

DUPEFILTER_CLASS

DUPEFILTER_DEBUG

EDITOR

EXTENSIONS

EXTENSIONS_BASE

FEED_TEMPDIR

ITEM_PIPELINES

ITEM_PIPELINES_BASE

LOG_ENABLED

LOG_ENCODING

LOG_FILE

LOG_FORMAT

LOG_DATEFORMAT

LOG_LEVEL

LOG_STDOUT

LOG_SHORT_NAMES

MEMDEBUG_ENABLED

MEMDEBUG_NOTIFY

MEMUSAGE_ENABLED

MEMUSAGE_LIMIT_MB

MEMUSAGE_CHECK_INTERVAL_SECONDS

MEMUSAGE_NOTIFY_MAIL

MEMUSAGE_REPORT

MEMUSAGE_WARNING_MB

NEWSPIDER_MODULE

RANDOMIZE_DOWNLOAD_DELAY

REACTOR_THREADPOOL_MAXSIZE

REDIRECT_MAX_TIMES

REDIRECT_PRIORITY_ADJUST

RETRY_PRIORITY_ADJUST

ROBOTSTXT_OBEY

SCHEDULER

SCHEDULER_DEBUG

SCHEDULER_DISK_QUEUE

SCHEDULER_MEMORY_QUEUE

SCHEDULER_PRIORITY_QUEUE

SPIDER_CONTRACTS

SPIDER_CONTRACTS_BASE

SPIDER_LOADER_CLASS

34 KiB

Raw Blame History