Custom timeout values for HTTP requests in WP

custom-http-requests-timeout.php

<?php
// NOTE: THE CODE TO COPY/PASTE STARTS *BELOW* THIS LINE

/**
* The snippets below use 30 seconds for testing. If they help, try lowering the value.
* If you are still getting cURL timeouts after raising the timeout to 30 seconds, your host must investigate the issue further.
*/

// Setting a custom timeout value for cURL. Using a high value for priority to ensure the function runs after any other added to the same action hook.
add_action('http_api_curl', 'sar_custom_curl_timeout', 9999, 1);
function sar_custom_curl_timeout( $handle ){
	curl_setopt( $handle, CURLOPT_CONNECTTIMEOUT, 30 ); // 30 seconds.
	curl_setopt( $handle, CURLOPT_TIMEOUT, 30 ); // 30 seconds.
}

// Setting custom timeout for the HTTP request
add_filter( 'http_request_timeout', 'sar_custom_http_request_timeout', 9999 );
function sar_custom_http_request_timeout( $timeout_value ) {
	return 30; // 30 seconds.
}

// Setting custom timeout in HTTP request args
add_filter('http_request_args', 'sar_custom_http_request_args', 9999, 1);
function sar_custom_http_request_args( $r ){
	$r['timeout'] = 30; // 30 seconds.
	return $r;
}

Could you please tell me where to paste those codes?

in functions.php