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https://issues.apache.org/jira/browse/NUTCH-2573?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sebastian Nagel resolved NUTCH-2573.
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Resolution: Implemented
> Suspend crawling if robots.txt fails to fetch with 5xx status
> -------------------------------------------------------------
>
> Key: NUTCH-2573
> URL: https://issues.apache.org/jira/browse/NUTCH-2573
> Project: Nutch
> Issue Type: Improvement
> Components: fetcher
> Affects Versions: 1.14
> Reporter: Sebastian Nagel
> Assignee: Sebastian Nagel
> Priority: Major
> Fix For: 1.19
>
>
> Fetcher should optionally (by default) suspend crawling by a configurable
> interval when fetching the robots.txt fails with a server errors (HTTP status
> code 5xx, esp. 503) following [Google's spec|
> https://developers.google.com/search/reference/robots_txt#handling-http-result-codes]:
> ??5xx (server error)??
> ??Server errors are seen as temporary errors that result in a "full disallow"
> of crawling. The request is retried until a non-server-error HTTP result code
> is obtained. A 503 (Service Unavailable) error will result in fairly frequent
> retrying. To temporarily suspend crawling, it is recommended to serve a 503
> HTTP result code. Handling of a permanent server error is undefined.??
> See also the [draft robots.txt RFC, section "Unreachable
> status"|https://datatracker.ietf.org/doc/html/draft-koster-rep-06#section-2.3.1.4].
> Crawler-commons robots rules already provide
> [isDeferVisits|https://crawler-commons.github.io/crawler-commons/1.2/crawlercommons/robots/BaseRobotRules.html#isDeferVisits--]
> to store this information (must be set from RobotRulesParser).
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