You are looking at the HTML representation of the XML format.
HTML is good for debugging, but is unsuitable for application use.
Specify the format parameter to change the output format.
To see the non HTML representation of the XML format, set format=xml.
See the complete documentation, or API help for more information. 
<?xml version="1.0"?>
<api>
  <query-continue>
    <allpages gapcontinue="lsで日本語のファイル名が表示できない時の解決方法" />
  </query-continue>
  <query>
    <pages>
      <page pageid="14" ns="0" title="curlでリダイレクトの遷移を追う方法" contentmodel="wikitext" pagelanguage="ja" touched="2017-06-13T13:13:15Z" lastrevid="29" counter="" length="2137" />
      <page pageid="6" ns="0" title="etcd" contentmodel="wikitext" pagelanguage="ja" touched="2017-04-14T16:00:38Z" lastrevid="15" counter="" length="2333" />
      <page pageid="22" ns="0" title="findで空のディレクトリを削除する方法" contentmodel="wikitext" pagelanguage="ja" touched="2018-05-03T07:54:03Z" lastrevid="47" counter="" length="2169" />
      <page pageid="13" ns="0" title="grepのGREP OPTIONSは廃止されました" contentmodel="wikitext" pagelanguage="ja" touched="2017-06-10T06:05:00Z" lastrevid="26" counter="" length="1655" new="" />
    </pages>
  </query>
</api>