Playmanifest cache control

benny_1 · September 20, 2016, 8:56am

when getting a m3u8 manifest using this URL:
http://domain.com/p/101/sp/10100/playManifest/entryId/0_fdgfilop/format/applehttp/protocol/http/master.m3u8

the cache-control header is:
Cache-Control: private, max-age=60, max-stale=0

where can I change that?

jess · September 20, 2016, 11:19am

Hello,

The default value is set here:

github.com

kaltura/server/blob/Lynx-12.2.0/api_v3/lib/KalturaResponseCacher.php#L21


*/
class KalturaResponseCacher extends kApiCache
{
	// copied from KalturaResponseType
	const RESPONSE_TYPE_XML = 2;
	const RESPONSE_TYPE_PHP = 3;
		
	static protected $cachedContentHeaders = array('content-type', 'content-disposition', 'content-length', 'content-transfer-encoding');
	
	protected $_defaultExpiry = 0;
	protected $_cacheHeadersExpiry = 60; // cache headers for CDN & browser - used  for GET request with kalsig param
			
	public function __construct($params = null, $cacheType = kCacheManager::CACHE_TYPE_API_V3, $expiry = 0)
	{
		if ($expiry)
			$this->_defaultExpiry = $this->_expiry = $expiry;
		
		$this->_cacheKeyPrefix = 'cache_v3-';
		
		parent::__construct($cacheType, $params);
	}

Then, in

github.com

kaltura/server/blob/Lynx-12.2.0/api_v3/lib/KalturaResponseCacher.php#L137


		$partnerId = $this->_ksObj ? $this->_ksObj->partner_id : 0;
		
		$forceCachingHeaders = false;
		if ($this->_ksObj && kConf::hasParam("force_caching_headers") && in_array($partnerId, kConf::get("force_caching_headers")))
			$forceCachingHeaders = true;


		// for GET requests with kalsig (signature of call params) return cdn/browser caching headers
		if ($usingCache && $isAnonymous && $_SERVER["REQUEST_METHOD"] == "GET" && isset($_REQUEST["kalsig"]) &&  
			(!self::hasExtraFields() || $forceCachingHeaders)) 
		{
			$v3cacheHeadersExpiry = kConf::get('v3cache_headers_expiry', 'local', array());
			if(isset($v3cacheHeadersExpiry[$partnerId]))
				$this->_cacheHeadersExpiry = $v3cacheHeadersExpiry[$partnerId];
		    		    
			$max_age = !is_null($this->minCacheTTL) ? min($this->_cacheHeadersExpiry, $this->minCacheTTL) : $this->_cacheHeadersExpiry ;
			header('Cache-Control: private, max-age=' . $max_age . ', max-stale=0');
			header('Expires: ' . gmdate('D, d M Y H:i:s', time() + $max_age) . ' GMT');
			header('Last-Modified: ' . gmdate('D, d M Y H:i:s', $lastModified) . ' GMT');
		}
		else
		{

there is an attempt to read an alternative value from app/configurations/local.ini.
The value is controlled per partner ID so in local.ini, assuming youtr partner ID is 101, you can add:

[v3cache_headers_expiry]
101 = 300

After reloading the Apache, the change should take affect and the value will be 300 instead of 60.

benny_1 · September 20, 2016, 11:43am

Thank you very much,

very helpful.

benny_1 · September 20, 2016, 12:20pm

By the way,

Is it possible to have different cache responses for different http status codes?

Maybe different cache response for 404 erros than to 302,200 codes?

jess · September 21, 2016, 1:05pm

Hi @benny_1,

Sorry but I’m afraid that’s not supported in the current code.