#45234 [NEW]: Incorrect Content-Length header

From: kulakov74 at yandex dot ru Operating system: Linux PHP version: 5.2CVS-2008-06-11 (snap) PHP Bug Type: Zlib Related Bug description: Incorrect Content-Length header Description: ------------ Many pointed out to the problem that the Content-Length header may have incorrect value when using zlib.output_compression. This problem may have been fixed but not completely. When the compressed data fits within 8K Content-Length is sent by zlib after compression and hence the header (if present) is updated correctly, but when the compressed data is larger no Content-Length is sent by zlib and hence the value is not fixed. 8K is the default buffer size for zlib (mod_deflate) and is not configurable. Anyway, whatever the size of the buffer is, I think the initial Content-Length should be removed when zlib cannot determine the size of the compressed data in advance. The following bugs are related: http://bugs.php.net/bug.php?id=28460 http://bugs.php.net/bug.php?id=22143 http://bugs.php.net/bug.php?id=24083 I guess many pages compress to more than 8K. Reproduce code: --------------- $FileToSend="filename.txt"; header("Content-Length: ".filesize($FileToSend)); readfile($FileToSend); Expected result: ---------------- Content-Length header with the right value or removed. Actual result: -------------- Content-Length header with the same value I set. Note that the file that is sent should COMPRESS to more than 8K in order for this to show. It may be 25K and the problem will not show up. -- Edit bug report at http://bugs.php.net/?id=45234&edit=1 -- Try a CVS snapshot (PHP 5.2): http://bugs.php.net/fix.php?id=45234&r=trysnapshot52 Try a CVS snapshot (PHP 5.3): http://bugs.php.net/fix.php?id=45234&r=trysnapshot53 Try a CVS snapshot (PHP 6.0): http://bugs.php.net/fix.php?id=45234&r=trysnapshot60 Fixed in CVS: http://bugs.php.net/fix.php?id=45234&r=fixedcvs Fixed in release: http://bugs.php.net/fix.php?id=45234&r=alreadyfixed Need backtrace: http://bugs.php.net/fix.php?id=45234&r=needtrace Need Reproduce Script: http://bugs.php.net/fix.php?id=45234&r=needscript Try newer version: http://bugs.php.net/fix.php?id=45234&r=oldversion Not developer issue: http://bugs.php.net/fix.php?id=45234&r=support Expected behavior: http://bugs.php.net/fix.php?id=45234&r=notwrong Not enough info: http://bugs.php.net/fix.php?id=45234&r=notenoughinfo Submitted twice: http://bugs.php.net/fix.php?id=45234&r=submittedtwice register_globals: http://bugs.php.net/fix.php?id=45234&r=globals PHP 4 support discontinued: http://bugs.php.net/fix.php?id=45234&r=php4 Daylight Savings: http://bugs.php.net/fix.php?id=45234&r=dst IIS Stability: http://bugs.php.net/fix.php?id=45234&r=isapi Install GNU Sed: http://bugs.php.net/fix.php?id=45234&r=gnused Floating point limitations: http://bugs.php.net/fix.php?id=45234&r=float No Zend Extensions: http://bugs.php.net/fix.php?id=45234&r=nozend MySQL Configuration Error: http://bugs.php.net/fix.php?id=45234&r=mysqlcfg