Inconsistent return of urls / get_bloginfo() vs get_template_directory_uri()

[luckyfella73]

It doesn't seem to happen in all server environments but on a WP instance hosted on IONOS (former 1&1) I get unexpected returns when using: get_template_directory_uri()

• I'm calling the page including https: and www. in the browser.
• I have WP_HOME and WP_SITEURL configured having the www. included.
• All urls relating to the page in the database have www. included.
• wp-admin/options-general.php shows the www. in both urls

When trying to load assets (js files) using get_template_directory_uri() to build the full url-path the www. is omitted. Due to crossdomain restrictions the files don't get loaded of course.

After looking at my configuration to find the error I might have done I found out that I get the domain with www. included when using get_bloginfo('url').

get_bloginfo('stylesheet_url') on the other hand does not return www. in the url. That is unexpected to me.

<?php
// returns no 'www.'
$get_template_directory_uri = get_template_directory_uri();
echo ("<p><code>get_template_directory_uri()</code>:<br>" . $get_template_directory_uri . "</p>");

// returns 'www.'
$get_bloginfo_url = get_bloginfo('url');
echo ("<p><code>get_bloginfo('url')</code>:<br>" . $get_bloginfo_url . "</p>");

// returns no 'www.'
$stylesheet_url = get_bloginfo('stylesheet_url');
echo ("<p><code>get_bloginfo('stylesheet_url')</code>:<br>" . $stylesheet_url . "</p>");

Environment:

• WordPress 6.4.2 (latest the time of writing)
• all plugins deactivated
• PHP 8.1.27