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Home: Perl Programming Help: Intermediate:
Wierd CGI header error


New User

Dec 18, 2003, 9:36 PM

Post #1 of 4 (623 views)
Wierd CGI header error Can't Post

I'm pulling my hair out so any help is very much appreciated. Here's the scenario:

I have a fully functional perl CGI script that connects to a MySQL database, using DBI, which outputs a list of all records found. (Extremely bare-bones) When I call this script with a web browser it outputs all records as expected. When I run it locally from a command prompt, it also works fine. Here's the catch. When I modify the statement to connect to an Access database, and not the MySQL, using an ODBC driver, I get an error in my browser that says : CGI Error

The specified CGI application misbehaved by not returning a complete set of HTTP headers.

If I run the .cgi script from a DOS prompt, though, everything looks fine. I get the proper "Content-type: text/html" header, and all records are returned as they should be. Bear in my mind, I haven't changed the rest of the script at all from the original. Why would the script work from the DOS prompt, but not when loaded in a browser? Below is the ONLY modification made in my script:

This one works (MySQL)

$dbh = DBI-> connect ("DBI:mysql:host=localhost;database=cars", "Maintenance", "password",{PrintError => 0, RaiseError => 1});

This one does not (Access-ODBC)

$dbh = DBI-> connect ("DBI:ODBC:CarData", {PrintError => 0, RaiseError => 1});

I think that some kind of error is kicking out before the header is output to the web, but this error doesn't happen when run locally. The printout looks PERFECT in a DOS window so I don't get why it's bombing out through a browser. I am running IIS 6.0 with the latest installation of ActivePerl from ActiveState. Please let me know if you need any further info at all. Thanks SOOOOOOO much for any help.


Thaumaturge / Moderator

Dec 19, 2003, 1:45 AM

Post #2 of 4 (622 views)
Re: [seth_h] Wierd CGI header error [In reply to] Can't Post

The problem is almost certainly that the CGI program is returning an error message _before_ the CGI headers. See Suffering from Buffering for a more detailed description of the problem.

Try putting


near the top of the program to turn off buffering. Also look in the web server error logs to see what the real error is.

Dave Cross, Perl Hacker, Trainer and Writer
Get more help at Perl Monks

New User

Dec 19, 2003, 9:37 AM

Post #3 of 4 (617 views)
Re: [davorg] Wierd CGI header error [In reply to] Can't Post

That didn't seem to do the trick. On another forum they suggested that I change my DBI declaration to the following:

$dbh = DBI-> connect ("DBI:ODBC:CarData", {PrintError => 1, RaiseError => 1});

which resulted in the following when run from a command prompt.

C:\cgi-bin>perl returnauction.cgi
[Fri Dec 19 12:30:16 2003] returnauction.cgi: Can't modify constant item in scal
ar assignment at returnauction.cgi line 7, near ");"
[Fri Dec 19 12:30:16 2003] returnauction.cgi: Execution of returnauction.cgi abo
rted due to compilation errors.


When I do that I get the following error. Any idea why?

Thanks again for your help.


Thaumaturge / Moderator

Dec 20, 2003, 9:25 AM

Post #4 of 4 (611 views)
Re: [seth_h] Wierd CGI header error [In reply to] Can't Post

I don't believe I suggested anything that would fix your problem. I made a suggestion that would make it simpler to work out what the problem is.

Without seeing more of the code (like line 7 for example) it's very hard to be any more help.

Dave Cross, Perl Hacker, Trainer and Writer
Get more help at Perl Monks


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