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Bug #32424 no output is sent after calling ob_flush() after sending headers
Submitted: 2005-03-23 10:34 UTC Modified: 2006-01-01 01:00 UTC
Votes:4
Avg. Score:3.2 ± 0.4
Reproduced:2 of 2 (100.0%)
Same Version:2 (100.0%)
Same OS:1 (50.0%)
From: tommythekid at mac dot com Assigned: thetaphi
Status: No Feedback Package: iPlanet related
PHP Version: 5.*, 4.* OS: Solaris 9 SPARC
Private report: No CVE-ID:
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 [2005-03-23 10:34 UTC] tommythekid at mac dot com
Description:
------------
no output is sent after calling ob_flush() after sending headers. This problem appears to be NSAPI related. Removing the first ob_flush() from the code produces the expected results.

Reproduce code:
---------------
while (ob_end_clean());

ob_start();

header("X-Foo: BAR");

ob_flush();
flush();


echo "PRE\n\n";


ob_flush();
flush();

echo "POST\n\n";


ob_flush();
flush();

Expected result:
----------------
HTTP/1.1 200 OK
Server: Sun-ONE-Web-Server/6.1
Date: Wed, 23 Mar 2005 09:31:45 GMT
Content-type: text/html
X-powered-by: PHP/5.0.3
X-foo: BAR
Connection: close

PRE

POST



Actual result:
--------------
HTTP/1.1 200 OK
Server: Sun-ONE-Web-Server/6.1
Date: Wed, 23 Mar 2005 09:24:38 GMT
Content-type: text/html
X-powered-by: PHP/5.0.3
X-foo: BAR
Connection: close


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 [2005-03-25 16:59 UTC] thetaphi@php.net
Hallo Jani,
I experienced that problem also in my servers in the past (in some other use-case: using of the nsapi_virtual() function which does implicitly a flush of the headers and buffers in the nsapi C code) but I do not know exactly if it is a nsapi problem or some general sapi/buffers problem.

What did you change? If it has something to do with NSAPI code please send me a private email with your changes, because I am not familar with the buffering code.

The interesting thing is:
This bug only happens when the flush/ob_flush is done before any output to the client is done (the buffer is empty). In my case: nsapi_virtual() is the first instruction in the php code.
Happens also in PHP 4.3.
If I should look after this bug after easter assign me to this bug.
 [2005-06-24 13:25 UTC] thetaphi@php.net
I analyzed this bug and found out what the problem is:
In a normal response stage the following functions of the SAPI module are called:
* n times header_handler()
* one time send_headers() before the first call of ub_write()

In the case of this bug the following happens:
if you do not have any output before ob_flush() (no echo etc.) the send_headers() SAPI function is never called. In NSAPI this leads to the fact that an webserver function to start the response is never called. Further writes to ub_write will then result in loss of data.
I think somewhere in SAPI.c the call to send_headers() is missing before ob_flush() when nothing was send before.

A fix only for NSAPI would be to trigger the calls and before write anything with ub_write a check is done and the start_response is added. But this is not the right solution.
 [2005-12-24 02:38 UTC] sniper@php.net
Please try using this CVS snapshot:

  http://snaps.php.net/php5.1-latest.tar.gz
 
For Windows:
 
  http://snaps.php.net/win32/php5.1-win32-latest.zip


 [2006-01-01 01:00 UTC] php-bugs at lists dot php dot net
No feedback was provided for this bug for over a week, so it is
being suspended automatically. If you are able to provide the
information that was originally requested, please do so and change
the status of the bug back to "Open".
 
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