<?xml version="1.0" encoding="UTF-8"?>
  <package xmlns="http://www.idpf.org/2007/opf"
         xmlns:redirect="http://xml.apache.org/xalan/redirect"
         version="1.0"
         unique-identifier="bookid">
   <metadata xmlns:opf="http://www.idpf.org/2007/opf"
             xmlns:dc="http://purl.org/dc/elements/1.1/">
      <dc:identifier id="bookid">XXXXXXXXXXXXX</dc:identifier>
      ...
      <meta name="cover" content="cover-image"/>
      ...
   </metadata>
   <manifest>
      ...
      <item id="cover-image"
            href="images/xxx.jpg"
            media-type="image/jpeg"
            properties="cover-image"/>
      ...
   </manifest>
   <spine toc="ncx">
    <itemref idref="xx" />
    ...
   </spine>
   <guide>
      <reference type="cover" title="Cover" href="cover.xhtml"/>
   </guide>
  </package>

"<meta name=\"cover\" content=\"cover-image\"/>\n" \

manifest.append("<item id=\"cover-image\" href=\"{0}\" media-type=\"image/png\" properties=\"cover-image\" />".format("/path/to/cover"))

def create_cover(self):
        response = self.requests_provider(self.api_url)
        parsed = response.json()
        for i in parsed['chapters']:
            # very vulnerable as publishers may differ
            if 'cover.' or 'Cover.' or 'titlepage.' in i:
                cover_url = i
                break

        if cover_url:
            cover_response = self.requests_provider(cover_url)
            cover_parsed = cover_response.json()
            imgAttrib = cover_parsed['images']
            if imgAttrib:
                lst2str = "".join(list(map(str, imgAttrib)))
                return "Images/" + lst2str.split('/')[-1]
            else:
                # if no covers found, fall back to fuzzy thumbnails
                return "Images/" + self.get_default_cover()
         else:
            return "Images/" + self.get_default_cover()