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 apcontinue="Openvswitch_vxlan_hello_world_example" />
  </query-continue>
  <query>
    <allpages>
      <p pageid="8" ns="0" title="Change apache umask for modified files" />
      <p pageid="19" ns="0" title="Compile git with ssl https support" />
      <p pageid="20" ns="0" title="Dns spf record" />
      <p pageid="13" ns="0" title="Esxi mac error" />
      <p pageid="15" ns="0" title="Fail2ban unban ip" />
      <p pageid="7" ns="0" title="Firewalld rich rule" />
      <p pageid="16" ns="0" title="Linux proxy variables" />
      <p pageid="25" ns="0" title="Lvm fsck in rescue mode" />
      <p pageid="2" ns="0" title="Main Page" />
      <p pageid="11" ns="0" title="Mongodb" />
    </allpages>
  </query>
</api>