httpcomponents-client/hc-checkstyle.xml

<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE module PUBLIC
    "-//Puppy Crawl//DTD Check Configuration 1.2//EN"
    "http://www.puppycrawl.com/dtds/configuration_1_2.dtd">

<module name="Checker">
  <module name="TreeWalker">
    <module name="AvoidStarImport"/>
    <module name="IllegalImport" />
    <module name="RedundantImport" />
  </module>
  <module name="Header">
    <property name="headerFile" value="asl2.header" />
  </module>
  <module name="FileLength">
    <property name="max" value="10000" />
  </module>
  <module name="FileTabCharacter">
    <property name="eachLine" value="true"/>
  </module>
  <module name="RegexpSingleline">
    <property name="format" value="[ \t]+$"/>
    <property name="message" value="Trailing whitespace"/>
  </module>
</module>