Re: Large File Not Being Sent To Client

John C. Frickson wrote:
On 2007-03-09 10:28, John C. Frickson wrote:
My company produces reports for our customers in PDF format. I have a
php script that verifies login status and access rights, and sends
the pdf to the client using readfile().

This has worked fine until recently. One of our customers' reports
is 10.6MB, and the customer never receives it and I can't get it
either. I checked the Apache access_log, and it shows varying
amounts of bytes being sent, but always close to 10MB.

I tried changing the php script to do fopen(), fread(), echo,
ob_flush() and flush(). After each flush, I write a message to a log
file. The messages in the log file stop at 10MB, as if the php script
is hung.

Using a network monitor, I see the connection being established, the
HTTP GET being sent, but no content coming back.

PHP version is 5.1.2
Apache is 2.2.3
OS is SuSE Linux Enterprise Server 10.0 - 64bit

Current test version looks like this:

ini_set("output_buffering", "0");
ini_set("implicit_flush", "1");
ini_set("memory_limit", "100M");
ini_set("max_execution_time", "600");
$lth = 0;
$in = fopen($path, "r");
while (!feof($in)) {
$data = fread($in, 8192);
$lth += strlen($data);
$errLog->WriteLog("Read $lth bytes" , "debug.txt");
echo $data;
$errLog->WriteLog("After echo" , "debug.txt");
ob_flush();
$errLog->WriteLog("After ob_flush" , "debug.txt");
flush();
$errLog->WriteLog("After flush" , "debug.txt");
}
$errLog->WriteLog("Got EOF", "debug.txt");
fclose($in);
$errLog->WriteLog("End of Script - read $lth bytes", "debug.txt");


The last five lines of the debug.txt log file say:

Read 10223616 bytes
After echo
After ob_flush
After flush
Read 10231808 bytes
After echo

So it's never returning from the ob_flush() call. Time from first
log entry to last is about 1 second.

Any ideas?
John

I noticed I didn't have a "Content-Length" header, so I added it
and it's now working. Even without the header, it should have
worked anyway, shouldn't it?

Not reliably. There is a reason for the Content-Length header - to let the browser know how much to expect.

Without the header the browser is free to figure on it's own how long the data should be (no browser I know of allows "unlimited length). And evidently you finally exceeded the browser default.


--
==================
Remove the "x" from my email address
Jerry Stuckle
JDS Computer Training Corp.
jstucklex@xxxxxxxxxxxxx
==================
.

Relevant Pages

  • Large File Not Being Sent To Client
    ... My company produces reports for our customers in PDF format. ... I tried changing the php script to do fopen, fread, echo, ... The messages in the log file stop at 10MB, ...
    (comp.lang.php)
  • Re: Large File Not Being Sent To Client
    ... I tried changing the php script to do fopen, fread, echo, ... After each flush, I write a message to a log ... The messages in the log file stop at 10MB, ...
    (comp.lang.php)
  • Re: Large File Not Being Sent To Client
    ... I tried changing the php script to do fopen, fread, echo, ... The messages in the log file stop at 10MB, ... Without the header the browser is free to figure on it's own how long the data should be. ...
    (comp.lang.php)
  • Re: Large File Not Being Sent To Client
    ... I tried changing the php script to do fopen, fread, echo, ... The messages in the log file stop at 10MB, ... Without the header the browser is free to figure on it's own how long the data should be. ...
    (comp.lang.php)
  • Comment modes behavior in HTML and PHP
    ... I have a PHP script, ... echo "should this be echoed ?"; ... As expected, the browser shows nothing, ... <!-- start HTML comment ...
    (php.general)