#34223 [NEW]: Some of suggested no-cache headers are useless

From: pornel at despammed dot com Operating system: * PHP version: Irrelevant PHP Bug Type: Documentation problem Bug description: Some of suggested no-cache headers are useless Description: ------------ In http://php.net/header // Date in the past header("Expires: Mon, 26 Jul 1997 05:00:00 GMT"); // always modified header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT"); // HTTP/1.1 header("Cache-Control: no-store, no-cache, must-revalidate"); header("Cache-Control: post-check=0, pre-check=0", false); // HTTP/1.0 header("Pragma: no-cache"); Despite disclaimer under this example I think useless headers should be removed. last-modified is last resort in finding freshness of an object, and is not needed when expires and cache-control are present. post-check and pre-check headers are always ignored when no-cache is specified. on most proxies no-cache and no-store make no difference, but the latter may impose extra restrictions in handling "sensitive information" and should not be abused just for any dynamic data. Expected result: ---------------- header("Cache-Control: no-cache, must-revalidate"); header("Expires: Mon, 26 Jul 1997 05:00:00 GMT"); Actual result: -------------- abuse of http by clueless copy'n'pasters. backtraces to these lines in php docs :) -- Edit bug report at http://bugs.php.net/?id=34223&edit=1 -- Try a CVS snapshot (php4): http://bugs.php.net/fix.php?id=34223&r=trysnapshot4 Try a CVS snapshot (php5.0): http://bugs.php.net/fix.php?id=34223&r=trysnapshot50 Try a CVS snapshot (php5.1): http://bugs.php.net/fix.php?id=34223&r=trysnapshot51 Fixed in CVS: http://bugs.php.net/fix.php?id=34223&r=fixedcvs Fixed in release: http://bugs.php.net/fix.php?id=34223&r=alreadyfixed Need backtrace: http://bugs.php.net/fix.php?id=34223&r=needtrace Need Reproduce Script: http://bugs.php.net/fix.php?id=34223&r=needscript Try newer version: http://bugs.php.net/fix.php?id=34223&r=oldversion Not developer issue: http://bugs.php.net/fix.php?id=34223&r=support Expected behavior: http://bugs.php.net/fix.php?id=34223&r=notwrong Not enough info: http://bugs.php.net/fix.php?id=34223&r=notenoughinfo Submitted twice: http://bugs.php.net/fix.php?id=34223&r=submittedtwice register_globals: http://bugs.php.net/fix.php?id=34223&r=globals PHP 3 support discontinued: http://bugs.php.net/fix.php?id=34223&r=php3 Daylight Savings: http://bugs.php.net/fix.php?id=34223&r=dst IIS Stability: http://bugs.php.net/fix.php?id=34223&r=isapi Install GNU Sed: http://bugs.php.net/fix.php?id=34223&r=gnused Floating point limitations: http://bugs.php.net/fix.php?id=34223&r=float No Zend Extensions: http://bugs.php.net/fix.php?id=34223&r=nozend MySQL Configuration Error: http://bugs.php.net/fix.php?id=34223&r=mysqlcfg