Apache returning malformed header from script for Perl CGI script

Question

I am running a perl script on an Apache httpd server and intermittently I get 500 Internal Server Error.

When I check the error log , I see below error :

Mon Feb 22 15:04:25 2021] [error] [client xxx.xxx.xx.xx ] malformed header from script. Bad header=Can I override this?: test.cgi

Can someone please let me know what could have went wrong ?

Cross-posted to /r/perl reddit.com/r/perl/comments/m2mbve/… — brian d foy
– brian d foy, Commented Mar 12, 2021 at 3:03

Dave Cross · Accepted Answer · 2021-03-11 10:27:00Z

1

This first text that a CGI program should print to STDOUT is the CGI headers (which will probably include Content-type:).

It seems that under some circumstances, your program prints the string "Can I override this?" before those headers. The web server tries to parse that string as a header, fails and throws an error.

Look at your code, find out why it is printing that string and either stop it from doing so or ensure that the correct headers are printed first.

Without seeing your code, it's hard to be much more help.

edited Mar 11, 2021 at 10:27

answered Mar 11, 2021 at 10:04

Dave Cross

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