absolute url of inline images in body using views and services
This is discussed for a long time, but unfortunately there is no solution committed to core until now, see https://www.drupal.org/node/2630076

Basically this tells you, that you need a text filter like this

http://cgit.drupalcode.org/drupal/tree/core/modules/editor/src/Plugin/Filter/EditorFileReference.php

where you change the line

$node-&gt;setAttribute('src', file_url_transform_relative(file_create_url($file-&gt;getFileUri())));


to

$node-&gt;setAttribute('src', file_create_url($file-&gt;getFileUri()));


by removing url_transform_relative().