How-to add a script to the header tag

Are you using your own theme?

Thanks for the quick response!

To answer your question:
Sort of – I’m using child themes.
Typically based on one of the Themify themes.

Do you have a functions.php file?

Yes – there is such a file.

Just pop your script in header.php

Of course, you should do this in your child header so it doesn’t go AWOL when WP ubdates.

Put your JavaScript into a (.js) file.

Then load that file through your functions.php file by using the “wp_enqueue_script” function.
https://www.codex.www.ads-software.com/Function_Reference/wp_enqueue_script

E.g.:

function myCustomScript() {

       // My custom-script.js file is at the following path /wp-content/themes/my-child-theme/js/custom-script.js

       // Note you'll have to use "get_stylesheet_directory_uri()" if you're using a child theme and the script is in your child theme

        wp_enqueue_script( 'a-script-that-does-this', get_stylesheet_directory_uri() . '/js/my-custom-script.js', '', '1.0' );

}

add_action( 'wp_enqueue_scripts', 'myCustomScript' );

Thanks guys – great!

Please allow me to go a bit off-topic here… ??
Would you know a way to do the same in Apache and Tomcat?

There are two reasons for an approach like that.
(1) – I expect it to work regardless the CMS I’m working with; the same expectation are for Tomcat and Java applications.
(2) – I’m able to start this as early as possible => includes monitoring the performance of the CMS itself.

Sounds like you need to contact your hosting providers about this. We can only give WordPress support here.

@andrew:
In this case I’m the hosting provider… ??

Then maybe an Apache and Tomcat forum is better suited for you.