/**
* Set the headers to prevent caching for the different browsers.
*
* Different browsers support different nocache headers, so several
* headers must be sent so that all of them get the point that no
* caching should occur.
*
* @since 0.0.1
*
* @see hq_get_nocache_headers()
*/
function nocache_headers()
{
$headers = hq_get_nocache_headers();
unset($headers['Last-Modified']);
// In PHP 5.3+, make sure we are not sending a Last-Modified header.
if (function_exists('header_remove')) {
@header_remove('Last-Modified');
} else {
// In PHP 5.2, send an empty Last-Modified header, but only as a
foreach (headers_list() as $header) {
if (0 === stripos($header, 'Last-Modified')) {
$headers['Last-Modified'] = '';
break;
}
}
}
foreach ($headers as $name => $field_value) {
@header("{$name}: {$field_value}");
}
}
/**
* Send additional HTTP headers for caching, content type, etc.
*
* Sets the X-Pingback header, 404 status (if 404), Content-type. If showing
* a feed, it will also send last-modified, etag, and 304 status if needed.
*
* @since 0.0.1
*/
public function send_headers()
{
$headers = array('X-Pingback' => get_bloginfo('pingback_url'));
$status = null;
$exit_required = false;
if (is_user_logged_in()) {
$headers = array_merge($headers, hq_get_nocache_headers());
}
if (!empty($this->query_vars['error'])) {
$status = (int) $this->query_vars['error'];
if (404 === $status) {
if (!is_user_logged_in()) {
$headers = array_merge($headers, hq_get_nocache_headers());
}
$headers['Content-Type'] = get_option('html_type') . '; charset=' . get_option('blog_charset');
} elseif (in_array($status, array(403, 500, 502, 503))) {
$exit_required = true;
}
} elseif (empty($this->query_vars['feed'])) {
$headers['Content-Type'] = get_option('html_type') . '; charset=' . get_option('blog_charset');
} else {
// We're showing a feed, so HQ is indeed the only thing that last changed
//TODO: Goyo no commnets
//if ( !empty($this->query_vars['withcomments'])
// || false !== strpos( $this->query_vars['feed'], 'comments-' )
// || ( empty($this->query_vars['withoutcomments'])
// && ( !empty($this->query_vars['p'])
// || !empty($this->query_vars['name'])
// || !empty($this->query_vars['page_id'])
// || !empty($this->query_vars['pagename'])
// || !empty($this->query_vars['attachment'])
// || !empty($this->query_vars['attachment_id'])
// )
// )
//)
// $hq_last_modified = mysql2date('D, d M Y H:i:s', get_lastcommentmodified('GMT'), 0).' GMT';
//else
$hq_last_modified = mysql2date('D, d M Y H:i:s', get_lastpostmodified('GMT'), 0) . ' GMT';
$hq_etag = '"' . md5($hq_last_modified) . '"';
$headers['Last-Modified'] = $hq_last_modified;
$headers['ETag'] = $hq_etag;
// Support for Conditional GET
if (isset($_SERVER['HTTP_IF_NONE_MATCH'])) {
$client_etag = hq_unslash($_SERVER['HTTP_IF_NONE_MATCH']);
} else {
$client_etag = false;
}
$client_last_modified = empty($_SERVER['HTTP_IF_MODIFIED_SINCE']) ? '' : trim($_SERVER['HTTP_IF_MODIFIED_SINCE']);
// If string is empty, return 0. If not, attempt to parse into a timestamp
$client_modified_timestamp = $client_last_modified ? strtotime($client_last_modified) : 0;
// Make a timestamp for our most recent modification...
$hq_modified_timestamp = strtotime($hq_last_modified);
if ($client_last_modified && $client_etag ? $client_modified_timestamp >= $hq_modified_timestamp && $client_etag == $hq_etag : $client_modified_timestamp >= $hq_modified_timestamp || $client_etag == $hq_etag) {
$status = 304;
$exit_required = true;
}
}
/**
* Filter the HTTP headers before they're sent to the browser.
*
* @since 0.0.1
*
* @param array $headers The list of headers to be sent.
* @param HQ $this Current HiveQueen environment instance.
*/
$headers = apply_filters('hq_headers', $headers, $this);
if (!empty($status)) {
status_header($status);
}
// If Last-Modified is set to false, it should not be sent (no-cache situation).
if (isset($headers['Last-Modified']) && false === $headers['Last-Modified']) {
unset($headers['Last-Modified']);
// In PHP 5.3+, make sure we are not sending a Last-Modified header.
if (function_exists('header_remove')) {
@header_remove('Last-Modified');
} else {
// In PHP 5.2, send an empty Last-Modified header, but only as a
foreach (headers_list() as $header) {
if (0 === stripos($header, 'Last-Modified')) {
$headers['Last-Modified'] = '';
break;
}
}
}
}
foreach ((array) $headers as $name => $field_value) {
@header("{$name}: {$field_value}");
}
if ($exit_required) {
exit;
}
/**
* Fires once the requested HTTP headers for caching, content type, etc. have been sent.
*
* @since 0.0.1
*
* @param HQ &$this Current HiveQueen environment instance (passed by reference).
*/
do_action_ref_array('send_headers', array(&$this));
}