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NUTCH-3011 HttpRobotRulesParser: handle HTTP 429 Too Many Requests same as server errors (HTTP 5xx) #786

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Oct 21, 2023
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NUTCH-3011 HttpRobotRulesParser: handle HTTP 429 Too Many Requests same as server errors (HTTP 5xx) #786

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11 changes: 6 additions & 5 deletions conf/nutch-default.xml
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Original file line number Diff line number Diff line change
Expand Up @@ -141,25 +141,26 @@
<name>http.robots.503.defer.visits</name>
<value>true</value>
<description>Temporarily suspend fetching from a host if the
robots.txt response is HTTP 503 or any other 5xx server error. See
also http.robots.503.defer.visits.delay and
robots.txt response is HTTP 503 or any other 5xx server error
and HTTP 429 Too Many Requests. See also
http.robots.503.defer.visits.delay and
http.robots.503.defer.visits.retries</description>
</property>

<property>
<name>http.robots.503.defer.visits.delay</name>
<value>300000</value>
<description>Time in milliseconds to suspend crawling a host if the
robots.txt response is HTTP 5xx - see
robots.txt response is HTTP 5xx or 429 Too Many Requests - see
http.robots.503.defer.visits.</description>
</property>

<property>
<name>http.robots.503.defer.visits.retries</name>
<value>3</value>
<description>Number of retries crawling a host if the robots.txt
response is HTTP 5xx - see http.robots.503.defer.visits. After n
retries the host queue is dropped for this segment/cycle.
response is HTTP 5xx or 429 - see http.robots.503.defer.visits.
After n retries the host queue is dropped for this segment/cycle.
</description>
</property>

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3 changes: 2 additions & 1 deletion src/plugin/lib-http/src/java/org/apache/nutch/protocol/http/api/HttpRobotRulesParser.java
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Expand Up @@ -229,7 +229,8 @@ public BaseRobotRules getRobotRulesSet(Protocol http, URL url,
else if ((code == 403) && (!allowForbidden))
robotRules = FORBID_ALL_RULES; // use forbid all

else if (code >= 500) {
else if (code >= 500 || code == 429) {
// 5xx server errors or 429 Too Many Requests
cacheRule = false; // try again later to fetch robots.txt
if (deferVisits503) {
// signal fetcher to suspend crawling for this host
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