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>
    <allredirects>
      <r ns="0" title="Bonecam 3" />
      <r ns="0" title="Cryogenic Cooling for Microwave Frontends" />
      <r ns="0" title="Digital Video Transmission" />
      <r ns="0" title="GRAPT" />
      <r ns="0" title="Gstreamer cheat sheet" />
      <r ns="0" title="High quality screen capture with Ffmpeg" />
      <r ns="0" title="Logitech HD Pro Webcam C910" />
      <r ns="0" title="Mobile Radio Control Panel" />
      <r ns="0" title="Receiving LRO and LCROSS" />
      <r ns="0" title="Simple DVB with Gstreamer and GNU Radio" />
    </allredirects>
  </query>
</api>