Sebastian Nagel created NUTCH-2573: -------------------------------------- Summary: 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 Fix For: 1.15
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.?? Crawler-commons robots rules already provide [isDeverVisitis|http://crawler-commons.github.io/crawler-commons/0.9/crawlercommons/robots/BaseRobotRules.html#isDeferVisits--] to store this information (set from RobotRulesParser). -- This message was sent by Atlassian JIRA (v7.6.3#76005)