wp_cache_get_response_headers() │ WPSCache 1.0

Returns

null. Nothing (null).

Usage

wp_cache_get_response_headers();

wp_cache_get_response_headers() wp cache get response headers code ^{WPSCache 3.1.0}

function wp_cache_get_response_headers() {
	static $known_headers = array(
		'Access-Control-Allow-Origin',
		'Accept-Ranges',
		'Age',
		'Allow',
		'Cache-Control',
		'Connection',
		'Content-Encoding',
		'Content-Language',
		'Content-Length',
		'Content-Location',
		'Content-MD5',
		'Content-Disposition',
		'Content-Range',
		'Content-Type',
		'Date',
		'ETag',
		'Expires',
		'Last-Modified',
		'Link',
		'Location',
		'P3P',
		'Pragma',
		'Proxy-Authenticate',
		'Referrer-Policy',
		'Refresh',
		'Retry-After',
		'Server',
		'Status',
		'Strict-Transport-Security',
		'Trailer',
		'Transfer-Encoding',
		'Upgrade',
		'Vary',
		'Via',
		'Warning',
		'WWW-Authenticate',
		'X-Frame-Options',
		'Public-Key-Pins',
		'X-XSS-Protection',
		'Content-Security-Policy',
		'X-Pingback',
		'X-Content-Security-Policy',
		'X-WebKit-CSP',
		'X-Content-Type-Options',
		'X-Powered-By',
		'X-UA-Compatible',
		'X-Robots-Tag',
	);

	if ( ! function_exists( 'headers_list' ) ) {
		return array();
	}

	$known_headers = apply_filters( 'wpsc_known_headers', $known_headers );

	if ( ! isset( $known_headers['age'] ) ) {
		$known_headers = array_map( 'strtolower', $known_headers );
	}

	$headers = array();
	foreach ( headers_list() as $hdr ) {
		$ptr = strpos( $hdr, ':' );

		if ( empty( $ptr ) ) {
			continue;
		}

		$hdr_key = rtrim( substr( $hdr, 0, $ptr ) );

		if ( in_array( strtolower( $hdr_key ), $known_headers, true ) ) {
			$hdr_val = ltrim( substr( $hdr, $ptr + 1 ) );

			if ( ! empty( $headers[ $hdr_key ] ) ) {
				$hdr_val = $headers[ $hdr_key ] . ', ' . $hdr_val;
			}

			$headers[ $hdr_key ] = $hdr_val;
		}
	}

	return $headers;
}