#45234 [Opn->Fbk]: Incorrect Content-Length header

ID: 45234 Updated by: jani@php.net Reported By: kulakov74 at yandex dot ru -Status: Open +Status: Feedback Bug Type: Zlib Related Operating System: Linux PHP Version: 5.2CVS-2008-06-11 (snap) New Comment: Please try using this CVS snapshot: http://snaps.php.net/php5.2-latest.tar.gz For Windows: http://windows.php.net/snapshots/ Previous Comments: ------------------------------------------------------------------------ [2008-06-11 11:03:49] kulakov74 at yandex dot ru 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 this bug report at http://bugs.php.net/?id=45234&edit=1