parse post.content and add the necessary protocol to images url

feed.xml

@@ -4,6 +4,7 @@ layout: none
 <?xml version="1.0" encoding="utf-8"?>
 <feed xmlns="http://www.w3.org/2005/Atom" xml:lang="en">
 <title type="text">{{ site.title }}</title>
+
 <generator uri="https://github.com/mojombo/jekyll">Jekyll</generator>
 {% if site.url != '' and site.url | split: '/' | first != 'http:' and site.url | split: '/' | first != 'https:' %}{% assign url = site.url | prepend: 'http:' %}{% else %}{% assign url = site.url %}{% endif %}
 <link rel="self" type="application/atom+xml" href="{{ url }}/feed.xml" />
@@ -31,7 +32,12 @@ layout: none
     <email>{{ site.owner.email }}</email>
   </author>
   {% for tag in post.tags %}<category scheme="{{ url }}/tags/#{{ tag | uri_escape }}" term="{{ tag }}" />{% endfor %}
-  <content type="html">{{ post.content | xml_escape }}
+  <content type="html">
+  {% if site.url != '' and site.url | split: '/' | first != 'http:' and site.url | split: '/' | first != 'https:' %}
+    {{ post.content | xml_escape | replace:  site.url, url }}
+  {% else %}
+    {{ post.content | xml_escape }}
+  {% endif %}
   &lt;p&gt;&lt;a href=&quot;{{ url }}{{ post.url }}&quot;&gt;{{ post.title }}&lt;/a&gt; was originally published by {{ site.owner.name }} at &lt;a href=&quot;{{ url }}&quot;&gt;{{ site.title }}&lt;/a&gt; on {{ post.date | date: "%B %d, %Y" }}.&lt;/p&gt;</content>
 </entry>
 {% endfor %}