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Date:  Tue, 09 Jun 2009 19:54:16 +0800
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Subject:  A question about ap_content_length_filter()
From: ptr.wang@gmail.com (Peter Wang)


hi, all.

<code>
<?php
// ~/www/htdocs/v.php
header("Content-Type: text/plain");
echo str_repeat('a', intval($_GET['s']));
?>
</code>

test the php code above,
when request with "/v.php?s=8000", I got

HTTP/1.1 200 OK
Date: Tue, 09 Jun 2009 11:41:54 GMT
Server: Apache
Content-Length: 8000
Connection: close
Content-Type: text/plain

it's fine, but while request with "/v.php?s=8001", i got:

HTTP/1.1 200 OK
Date: Tue, 09 Jun 2009 11:43:09 GMT
Server: Apache
Connection: close
Transfer-Encoding: chunked
Content-Type: text/plain

so, my question is: when response size <= 8000,
the request contains a Content-Length field,
otherwise, it uses chunked.

8000 may be very specific on my server, i wonder
where can i tuning such a limit. I have tried to
change output_buffering in php.ini from 4096 to
8192 to tuning that limit, but it seems nothing changes.

thanks for your suggestions.