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https://issues.apache.org/jira/browse/NUTCH-2522?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16387538#comment-16387538
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ASF GitHub Bot commented on NUTCH-2522:
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sebastian-nagel commented on a change in pull request #290: NUTCH-2522
URL: https://github.com/apache/nutch/pull/290#discussion_r172457592
##########
File path: conf/db-ignore-external-exemptions-bidirectional.txt
##########
@@ -0,0 +1,33 @@
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements. See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You under the Apache License, Version 2.0
+# (the "License"); you may not use this file except in compliance with
+# the License. You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+#
+# Exemption rules to db.ignore.external.links
+
+
+# Format :
+#--------
+# The format is same same as `regex-urlfilter.txt`.
+# Each non-comment, non-blank line contains a regular expression
Review comment:
The description does not match the implementation.
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> Bidirectional URL exemption filter
> -----------------------------------
>
> Key: NUTCH-2522
> URL: https://issues.apache.org/jira/browse/NUTCH-2522
> Project: Nutch
> Issue Type: Improvement
> Components: plugin
> Reporter: Semyon Semyonov
> Priority: Minor
>
> The current Nutch Url Exemption plugin exempts based on toUrl only, the new
> plugin uses both fromUrl and toUrl and after the regex transformation,
> exempts based on condition regex(fromUrl) == regex(toUrl).
> This approach allows us to perform more complex url exemption filter checks,
> such as allow links:
> http://[www.website.com/|http://www.website.com/]home ->
> http://[website.com/a|http://www.website.com/]bout ( with/without www).
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