PHP :: Bug #19450 :: GET request duplicated (SESSION+PDF+INTERNET EXPLORER)

Bug #19450	GET request duplicated (SESSION+PDF+INTERNET EXPLORER)
Submitted:	2002-09-17 06:34 UTC	Modified:	2002-09-17 10:37 UTC
From:	frederic dot surleau at atosorigin dot com	Assigned:
Status:	Not a bug	Package:	Session related
PHP Version:	4.2.3	OS:
Private report:	No	CVE-ID:	None

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From:	frederic dot surleau at atosorigin dot com
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[2002-09-17 06:34 UTC] frederic dot surleau at atosorigin dot com

Hi,
<?php
	$a = var_export( $_SERVER, true );

	session_start();
	
	$f = fopen( "toto.txt", "a" );
	fwrite( $f, "=======================\n$a\n" );
	fclose( $f );
	$len = filesize( "fl.pdf" );
	header( "Content-Type: application/pdf" );
	header( "Content-Disposition: inline; filename=fl.pdf" );
	header( "Content-Length: $len" );
	readfile( "fl.pdf" );
?>

When I ask for this page from IE 5.5 -> 6.0 the script is executed 2 times.

The file toto.txt contains : 
=======================
array (
  'DOCUMENT_ROOT' => '/var/www/1/s/u/r/surleau.com/www/',
  'HTTP_ACCEPT' => 'image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/vnd.ms-powerpoint, application/vnd.ms-excel, application/msword, */*',
  'HTTP_ACCEPT_ENCODING' => 'gzip, deflate',
  'HTTP_ACCEPT_LANGUAGE' => 'fr,en;q=0.5',
  'HTTP_CONNECTION' => 'close',
  'HTTP_COOKIE' => 'PHPSESSID=12332cb862f0ecb3def4b670727e2f25',
  'HTTP_HOST' => 'www.surleau.com',
  'HTTP_REFERER' => 'http://www.surleau.com/test/',
  'HTTP_USER_AGENT' => 'Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)',
  'HTTP_X_COMING_FROM' => '195.68.44.149',
  'PATH' => '/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/X11R6/bin',
  'REDIRECT_HOMEDIR' => '/var/www/1/s/u/r/surleau.com/www/',
  'REDIRECT_PHP_INCLUDE_PATH' => '/var/www/1/s/u/r/surleau.com/www/include/:.',
  'REDIRECT_REALNAME' => '/test/fl.php',
  'REDIRECT_REQUEST_URI' => '/test/fl.php',
  'REDIRECT_SCRIPT_NAME' => '/test/fl.php',
  'REDIRECT_SERVER_NAME' => 'www.surleau.com',
  'REDIRECT_SESSIONDIR' => '/var/www/1/s/u/r/surleau.com/www/sessions/',
  'REDIRECT_STATUS' => '200',
  'REDIRECT_UNIQUE_ID' => 'PYcRftQbI3IAAHZwPac',
  'REDIRECT_URL' => '/www.surleau.com/test/fl.php',
  'REMOTE_ADDR' => '195.68.44.149',
  'REMOTE_PORT' => '60203',
  'SCRIPT_FILENAME' => '/var/www/1/s/u/r/surleau.com/www/test/fl.php',
  'SERVER_ADDR' => '212.27.35.114',
  'SERVER_ADMIN' => 'no.valid@email',
  'SERVER_NAME' => 'www.surleau.com',
  'SERVER_PORT' => '80',
  'SERVER_SIGNATURE' => '',
  'SERVER_SOFTWARE' => 'Apache/1.3.20 (Unix) Debian/GNU mod_fastcgi/2.2.12 mod_perl/1.25',
  'UNIQUE_ID' => 'PYcRftQbI3IAAHZwPac',
  'GATEWAY_INTERFACE' => 'CGI/1.1',
  'SERVER_PROTOCOL' => 'HTTP/1.1',
  'REQUEST_METHOD' => 'GET',
  'QUERY_STRING' => '',
  'REQUEST_URI' => '/test/fl.php',
  'SCRIPT_NAME' => '/test/fl.php',
  'PATH_INFO' => '',
  'PATH_TRANSLATED' => '/var/www/1/s/u/r/surleau.com/www/test/fl.php',
  'PHP_SELF' => '/test/fl.php',
  'argv' => 
  array (
  ),
  'argc' => 0,
)
=======================
array (
  'DOCUMENT_ROOT' => '/var/www/1/s/u/r/surleau.com/www/',
  'HTTP_ACCEPT' => '*/*',
  'HTTP_ACCEPT_ENCODING' => 'gzip, deflate',
  'HTTP_CONNECTION' => 'close',
  'HTTP_COOKIE' => 'PHPSESSID=12332cb862f0ecb3def4b670727e2f25',
  'HTTP_HOST' => 'www.surleau.com',
  'HTTP_USER_AGENT' => 'Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)',
  'HTTP_X_COMING_FROM' => '195.68.44.149',
  'PATH' => '/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/X11R6/bin',
  'REDIRECT_HOMEDIR' => '/var/www/1/s/u/r/surleau.com/www/',
  'REDIRECT_PHP_INCLUDE_PATH' => '/var/www/1/s/u/r/surleau.com/www/include/:.',
  'REDIRECT_REALNAME' => '/test/fl.php',
  'REDIRECT_REQUEST_URI' => '/test/fl.php',
  'REDIRECT_SCRIPT_NAME' => '/test/fl.php',
  'REDIRECT_SERVER_NAME' => 'www.surleau.com',
  'REDIRECT_SESSIONDIR' => '/var/www/1/s/u/r/surleau.com/www/sessions/',
  'REDIRECT_STATUS' => '200',
  'REDIRECT_UNIQUE_ID' => 'PYcRgtQbI1cAAHAyMkM',
  'REDIRECT_URL' => '/www.surleau.com/test/fl.php',
  'REMOTE_ADDR' => '195.68.44.149',
  'REMOTE_PORT' => '60207',
  'SCRIPT_FILENAME' => '/var/www/1/s/u/r/surleau.com/www/test/fl.php',
  'SERVER_ADDR' => '212.27.35.87',
  'SERVER_ADMIN' => 'no.valid@email',
  'SERVER_NAME' => 'www.surleau.com',
  'SERVER_PORT' => '80',
  'SERVER_SIGNATURE' => '',
  'SERVER_SOFTWARE' => 'Apache/1.3.20 (Unix) Debian/GNU mod_fastcgi/2.2.12 mod_perl/1.25',
  'UNIQUE_ID' => 'PYcRgtQbI1cAAHAyMkM',
  'GATEWAY_INTERFACE' => 'CGI/1.1',
  'SERVER_PROTOCOL' => 'HTTP/1.1',
  'REQUEST_METHOD' => 'GET',
  'QUERY_STRING' => '',
  'REQUEST_URI' => '/test/fl.php',
  'SCRIPT_NAME' => '/test/fl.php',
  'PATH_INFO' => '',
  'PATH_TRANSLATED' => '/var/www/1/s/u/r/surleau.com/www/test/fl.php',
  'PHP_SELF' => '/test/fl.php',
  'argv' => 
  array (
  ),
  'argc' => 0,
)

With Mozilla 1.1, it's not the case.

Example with Mozilla :

=======================
array (
  'DOCUMENT_ROOT' => '/var/www/1/s/u/r/surleau.com/www/',
  'HTTP_ACCEPT' => 'text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,video/x-mng,image/png,image/jpeg,image/gif;q=0.2,text/css,*/*;q=0.1',
  'HTTP_ACCEPT_CHARSET' => 'ISO-8859-1, utf-8;q=0.66, *;q=0.66',
  'HTTP_ACCEPT_ENCODING' => 'gzip, deflate, compress;q=0.9',
  'HTTP_ACCEPT_LANGUAGE' => 'fr, en;q=0.66, en-us;q=0.33',
  'HTTP_CONNECTION' => 'close',
  'HTTP_HOST' => 'www.surleau.com',
  'HTTP_REFERER' => 'http://www.surleau.com/test/',
  'HTTP_USER_AGENT' => 'Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.1) Gecko/20020826',
  'HTTP_X_COMING_FROM' => '195.68.44.149',
  'PATH' => '/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/X11R6/bin',
  'REDIRECT_HOMEDIR' => '/var/www/1/s/u/r/surleau.com/www/',
  'REDIRECT_PHP_INCLUDE_PATH' => '/var/www/1/s/u/r/surleau.com/www/include/:.',
  'REDIRECT_REALNAME' => '/test/fl.php',
  'REDIRECT_REQUEST_URI' => '/test/fl.php',
  'REDIRECT_SCRIPT_NAME' => '/test/fl.php',
  'REDIRECT_SERVER_NAME' => 'www.surleau.com',
  'REDIRECT_SESSIONDIR' => '/var/www/1/s/u/r/surleau.com/www/sessions/',
  'REDIRECT_STATUS' => '200',
  'REDIRECT_UNIQUE_ID' => 'PYcSb9QbI2YAAEU4Ozc',
  'REDIRECT_URL' => '/www.surleau.com/test/fl.php',
  'REMOTE_ADDR' => '195.68.44.149',
  'REMOTE_PORT' => '36958',
  'SCRIPT_FILENAME' => '/var/www/1/s/u/r/surleau.com/www/test/fl.php',
  'SERVER_ADDR' => '212.27.35.102',
  'SERVER_ADMIN' => 'no.valid@email',
  'SERVER_NAME' => 'www.surleau.com',
  'SERVER_PORT' => '80',
  'SERVER_SIGNATURE' => '',
  'SERVER_SOFTWARE' => 'Apache/1.3.20 (Unix) Debian/GNU mod_fastcgi/2.2.12 mod_perl/1.25',
  'UNIQUE_ID' => 'PYcSb9QbI2YAAEU4Ozc',
  'GATEWAY_INTERFACE' => 'CGI/1.1',
  'SERVER_PROTOCOL' => 'HTTP/1.1',
  'REQUEST_METHOD' => 'GET',
  'QUERY_STRING' => '',
  'REQUEST_URI' => '/test/fl.php',
  'SCRIPT_NAME' => '/test/fl.php',
  'PATH_INFO' => '',
  'PATH_TRANSLATED' => '/var/www/1/s/u/r/surleau.com/www/test/fl.php',
  'PHP_SELF' => '/test/fl.php',
  'argv' => 
  array (
  ),
  'argc' => 0,
)

Can you explain me what appened ?

Regards.

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[2002-09-17 08:09 UTC] sniper@php.net

It's some IE bug. Not PHP problem in any case.

[2002-09-17 10:37 UTC] hholzgra@php.net

it is due to IE being to fast in disposing non-cacheable files

the temporary file that the plugin is supposed to open 
doesn't exist anymore when the plugin initializes as
IE has already removed it

you can work around  this by setting the session.cache_limiter
parameter to "private" to allow client side cacheing

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