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[2003-01-24 21:36 UTC] khoker at rjobrien dot com
When calling a PHP script that is using MSSQL or ODBC calls, I can reporduce this error at least one out of every ten tries, on multiple machines. I'm at the end of my rope trying to figure it out myself. If I can reproduce the error, I figure I am a prime candidate to help solve it. The error states:
CGI Error
The specified CGI application misbehaved by not returning a complete set of HTTP headers. The headers it did return are:
And that's it. There is nothing after "are:"
This is how I reproduce (test for) the error: I have a PHP script that generates a webpage. That webpage contains 4 iframes. (The iframes are nothing more than a php page that echoes <html><body>x</body></html>. The main page prints the code to invoke the iframes, and it also makes an MSSQL or ODBC query. NOTE: I can also reproduce this error when making a database call in conjuction with a header("location: ...") redirect as well, but that's a little more annoying to test than the iframes since it doesn't happen every time.
So, every reload on the main page is essentially 5 PHP requests (1 main + 4 iframes). If I refresh this test page, I can get at least one of the iframes to error every 5 tries. Which, of course, is at least one error every 25 requests.
Now on to the DB. If I comment out the DB call (be it an MSSQL or ODBC query) I cannot reproduce the error. This is my guess... the bug happens when PHP attempts to service a request at the exact moment something closes in the DB call. I'm sorry I can't do any better than that for troubleshooting. But, logically, the error is random enough that it doesn't happen EVERY time, so all I can guess is that it is a pure timing issue, which happens more frequently the more you hit the server as it is making a DB request.
Any other info I can offer... I can reproduce this with IIS on three Win2000 Servers and one Win2000 Professional box. I am not using Named Pipes. I've tried several versions of ntwdblib.dll and am currently using the one included with PHP 4.3.0 (12/27/2002). I only have SQL 2000 servers to connect to, but I've reproduced this bug with the three of them that I use regularly.
My desktop (the Windows 2000 Professional) box is what I test with most often, and it is running Service Pack 3 and is using the current MDAC (2.7 I believe).
I did not use the Win32 'installer' ... rather installed via the latest .zip and my production boxes are SMP machines, so until SAPI is given the thread-safe go-ahead I have to stick with the .exe
I can't think of anything more off the top of my head, but I would be more than willing to give whatever feedback is requested. Unfortunately, I thought this bug was only MSSQL related for some reason, so I've been putting off switching everything to ODBC. I was very saddened today when I experienced the error with ODBC as well. I've got approximately one week to solve this before I have to launch a new site with my company, and while the lauch will go either way, I don't want the executives to question my decision to use PHP instead of VBscript (as the other developers here know VB, and my argument/skills seemed strong enough to sway to the PHP side). I'm not trying to pull any heart strings here, like I said, the site is going to launch CGI errors or not, I'd just rather have it flawless (and not field end-user calls on the issue to boot).
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Additionally, I can offer the test script. Here is a bare-bones example. Testing this just now, it will error on at least one of the 6 iframes EVERY refresh. 1/6 requests is an error. Sorry the actual DSN and SQL query does no good, but if you really wanted to try this it will save a little hassle. <? if ($_GET['dummy']) { print "<html><body>x</body></html>"; exit(); } $sql_params = array( 'DSN' => 'myDSN', 'user' => 'user', 'pass' => 'pass', 'query' => 'SELECT DISTINCT field1 FROM table1', ); $conn = odbc_connect($sql_params['DSN'], $sql_params['user'], $sql_params['pass']) or die("Couldn't connect to SQL Server on {$sql_params['DSN']}"); $conn_id = odbc_exec($conn, $sql_params['query']); print odbc_num_fields($conn_id); odbc_free_result($conn_id); ?> <IFRAME width='300px' height='300px' scrolling='no' src="test_bug.php?dummy=true"></IFRAME> <IFRAME width='300px' height='300px' scrolling='no' src="test_bug.php?dummy=true"></IFRAME> <IFRAME width='300px' height='300px' scrolling='no' src="test_bug.php?dummy=true"></IFRAME> <IFRAME width='300px' height='300px' scrolling='no' src="test_bug.php?dummy=true"></IFRAME> <IFRAME width='300px' height='300px' scrolling='no' src="test_bug.php?dummy=true"></IFRAME> <IFRAME width='300px' height='300px' scrolling='no' src="test_bug.php?dummy=true"></IFRAME>