Set Cache-Control for ChangeLogs on the application side

Author: derickr

include/changelogs.inc

@@ -48,6 +48,8 @@ function changelog_header(int $major_version, array $minor_versions): void {
         'current' => 'docs',
         'css' => ['changelog.css'],
         'layout_span' => 12,
+        'cache' => true,
+        'cache_control' => 30 * 60, // 30 minutes
     ]);
     echo "<h1>PHP {$major_version} ChangeLog</h1>\n";
     $glue = '';

include/header.inc

@@ -49,6 +49,11 @@ if ($config["cache"]) {
     }
     header("Last-Modified: " . $tsstring);
 }
+
+if ($config["cache_control"] && is_numeric($config["cache_control"])) {
+	header("Cache-Control: public, max-age=" . (int) $config["cache_control"]);
+}
+
 if (!isset($config["languages"])) {
     $config["languages"] = [];
 }

include/layout.inc

@@ -456,6 +456,7 @@ function site_header(?string $title = NULL, array $config = []): void
         'classes' => '',
         'layout_span' => 9,
         "cache" => false,
+        'cache_control' => false,
         "headsup" => "",
         'meta_tags' => <<<META
 <meta name="Description" content="{$meta_description}" />