How To Add If Modified Since HTTP Header In WordPress

When ever you update your post/pages or images or anything in your website that need to update in google . If Modified Since HTTP Header is a conditional server response which tell the server that the page/ post or any thing inside your website has been updated or not .

If modified then Now server will send information to google bots that update has been made since the google bot last crawled the content . And google bot will download that content because that content has been update .

For crawling content from website Google bots accepts 2 kinds of response code from server which is 304 and 200 status code .

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What is 304 status code ?

304 status code means the website content has not been updated since the google crawler has last crawled the website . If the google bots get the 304 response then it means no need to download the content again and again .

What is 200 status code?

200 status code tell the google-bot that the content has been changed since they last crawled your website . Now google will fetch that updated content .

Why IF modified since is important for your website?

Google bots crawl billions and billion of pages everyday so their is no need to crawl the content which has not been updated since it was last crawled . For those who are running big big website which have 1000’s of post or pages need lots of extra bandwidth for website crawling . So by using this function in your website you can save huge amount of bandwidth

Steps require to add If Modified Since HTTP Header In WordPress

There is actually 2 ways by which you can add this function to your website .

Add if modified since http header to your WordPress website

Watch this video on YouTube

First method

login to cpanel >>>> then open public_html >>>>then open wp-content >>>> then open themes folder >>>> Now open your website theme folder which ever the themes you are using >>>> open function.php file and paste the following code

//If Modified Since HTTP Header gomahamaya
add_action('template_redirect', 'gom_add_last_modified_header');
function gom_add_last_modified_header($headers) {
if( is_singular() ) {
$post_id = get_queried_object_id();
if( $post_id ) {
header("Last-Modified: " . get_the_modified_time("D, d M Y H:i:s", $post_id) );}}}