The link cannot be resolved when the hostname is not included

[kaho]

example:

<channel>
  <link>/</link>
  <language>en</language>
  <atom:link href="/index.xml" rel="self" type="application/rss+xml" />
  <item>
    <link>/posts/2023/06/piem/</link>
	<guid>/posts/2023/06/piem/</guid>
  </item>
</channel>

When the link is in the above format, it will be resolved as null:

{
  "link": null,
  "language": "en",
  "atom:link": {
    "@_href": "/index.xml",
    "@_rel": "self",
    "@_type": "application/rss+xml"
  },
  "item": [
    {
      "link": null,
      "guid": "/posts/2023/06/piem/"
    }
  ]
}