From 19d6f15a7fa2c02ac6e143c4a296d6b361a088ee Mon Sep 17 00:00:00 2001
From: Erick Hitter <ehitter@gmail.com>
Date: Thu, 27 Feb 2014 18:20:34 -0800
Subject: [PATCH] Add default support for `Last-Modified` and `Cache-Control`
headers.
Fixes #3.
---
index-redis-page-cache.php | 31 ++++++++++++++++++++++++++-----
1 file changed, 26 insertions(+), 5 deletions(-)
diff --git a/index-redis-page-cache.php b/index-redis-page-cache.php
index 1c77f76..7b83886 100644
--- a/index-redis-page-cache.php
+++ b/index-redis-page-cache.php
@@ -38,6 +38,7 @@ $redis_page_cache_config = array(
'redis_port' => 6379,
'redis_db' => 0,
'cache_version' => 1,
+ 'cache_headers' => true,
'secret_string' => 'changeme',
);
@@ -307,7 +308,19 @@ try {
$load_wp = false;
$redis_page_cache_config['cached'] = true;
- echo trim( $redis->get( $redis_page_cache_config['redis_key'] ) );
+ $cache = unserialize( $redis->get( $redis_page_cache_config['redis_key'] ) );
+
+ if ( $redis_page_cache_config['cache_headers'] ) {
+ header( 'Last-Modified: ' . gmdate( 'D, d M Y H:i:s', $cache['time'] ) . ' GMT', true );
+ header( 'Cache-Control: max-age=' . $cache['age'] . ', must-revalidate', false );
+ }
+
+ echo trim( $cache['output'] );
+
+ if ( $redis_page_cache_config['debug'] ) {
+ $redis_page_cache_config['debug_messages'] .= "<!-- Last Modified: " . gmdate( 'D, d M Y H:i:s', $cache['time'] ) . " GMT . -->\n";
+ $redis_page_cache_config['debug_messages'] .= "<!-- Max Age: " . $cache['age'] . " -->\n";
+ }
// Display generation stats if requested
if ( $redis_page_cache_config['stats'] ) {
@@ -333,8 +346,8 @@ try {
// Render page into an output buffer and display
ob_start();
require_once dirname( __FILE__ ) . '/wp-blog-header.php';
- $markup_to_cache = trim( ob_get_clean() );
- echo $markup_to_cache;
+ $output = trim( ob_get_clean() );
+ echo $output;
// Display generation stats if requested
if ( $redis_page_cache_config['stats'] ) {
@@ -344,6 +357,12 @@ try {
// Cache rendered page if appropriate
if ( ! is_404() && ! is_search() ) {
+ $cache = array(
+ 'output' => $output,
+ 'time' => time(),
+ 'age' => 31536000, // one year in seconds
+ );
+
// Is unlimited cache life requested?
if ( ! isset( $redis_page_cache_config['unlimited'] ) ) {
$redis_page_cache_config['unlimited'] = (bool) get_option( 'redis-page-cache-debug', false );
@@ -351,7 +370,7 @@ try {
// Cache the page for the chosen duration
if ( $redis_page_cache_config['unlimited'] ) {
- $redis->set( $redis_page_cache_config['redis_key'], $markup_to_cache );
+ $redis->set( $redis_page_cache_config['redis_key'], serialize( $cache ) );
} else {
if ( ! isset( $redis_page_cache_config['cache_duration'] ) ) {
$redis_page_cache_config['cache_duration'] = (int) get_option( 'redis-page-cache-seconds', 43200 );
@@ -361,7 +380,9 @@ try {
$redis_page_cache_config['cache_duration'] = 43200;
}
- $redis->setex( $redis_page_cache_config['redis_key'], $redis_page_cache_config['cache_duration'], $markup_to_cache );
+ $cache['age'] = $redis_page_cache_config['cache_duration'];
+
+ $redis->setex( $redis_page_cache_config['redis_key'], $redis_page_cache_config['cache_duration'], serialize( $cache ) );
}
}
}
--
GitLab