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There are different ways to insert a HTTP header in WordPress depending on your requirements. Here are some methods:

1. Using a plugin: You can use a plugin such as WP Header Code Injector or Insert Headers and Footers to add custom headers to WordPress.

2. Adding code to functions.php file: You can add code directly to your theme’s functions.php file to add custom headers. Here’s an example:

addaction('sendheaders', 'addcustomheaders');function addcustomheaders() {header('X-Frame-Options: SAMEORIGIN');}

1. Using a header plugin: Some plugins such as HTTP Headers can be used to insert headers on your website.

It's recommended to use a plugin to avoid any errors and ensure that your website's performance isn't impacted by your custom HTTP header implementation.