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adding expiration headers to your wordpress website can significantly improve its performance by leveraging browser caching. this means that browsers will store certain resources for a specified amount of time, reducing the need to re-fetch them on subsequent visits. here's how to add expiration headers to your wordpress site using code.

step 1: access your theme's functions file

1. *log in to your wordpress admin dashboard.*
2. *navigate to appearance theme editor.*
3. *select the `functions.php` file* of your active theme from the right-hand side.

step 2: add code to set expiration headers

you can add the following code snippet to your `functions.php` file. this code uses the `send_headers` action hook to set the `cache-control` and `expires` headers for different types of files.



explanation of the code

**function definition**: the function `add_expire_headers` checks the requested uri to determine the type of file being requested (css, javascript, images, or favicon).
**setting headers**: for each type of file, it sets the `cache-control` and `expires` headers:
`max-age=31536000`: this specifies that the resource can be cached for one year (31,536,000 seconds).
`expires`: this provides an absolute date and time when the resource is considered expired.
**action hook**: `add_action('send_headers', 'add_expire_headers')` tells wordpress to run our function when it sends headers.

step 3: save changes

1. *click the "update file" button* to save your changes.

step 4: test your headers

after adding the code, you can check if the expiration headers are set correctly:

1. *open your website in a web browser.*
2. *right-click on the page and select "inspect" or "inspect element."*
3. *go to the "network" tab and refresh the page.*
4. click on any resource (like a `.css` or `.js` file), and check the headers in the right-hand pane. look for `cache-control` and `expires` headers.

additional tips

**backup your site**: before ...

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expire headers
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