Certainly. I made the template file test.tmpl exactly 9,000 bytes, consisting of only the following line repeated 90 times (last chr is a carriage return, so it is invisible):
123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789 The recorded output in my Apache script error log is: %% [Mon Jul 14 08:03:57 2014] GET /[path]/test.pl HTTP/1.1 %% 500 /[path]/test.pl %request Host: [host] Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 Accept-Language: en-US,en;q=0.5 Accept-Encoding: gzip, deflate DNT: 1 Connection: keep-alive %response 123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789 %stdout 123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789 123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789 123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789 123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789 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123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789 123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789 123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789 123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789 123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789 123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789 12345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012 Content-Type: text/html 3456789 123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789 123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789 123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789 123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789 123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789 123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789 123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789 123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789 It appears as if you are right about the buffering problem, especially given the position of "Content-Type". The command "$|=1;" to disable output buffering definitely helps (for now) and adding it to my script killed the error and effectively fixed the problem. I just wish I could find out where the buffering happens. It must be either in Perl or in HTML::Template::Pro and both mod_cgid/mod_cgi have an issue with it at 8k/4k. ________________________________ From: Jeff Trawick <traw...@gmail.com> To: "users@httpd.apache.org" <users@httpd.apache.org>; Tom Phan <yachtus-apa...@yahoo.com> Sent: Saturday, July 12, 2014 4:53 PM Subject: Re: [users@httpd] Apache cgid:error for HTML::Template::Pro templates larger than 8k On Thu, Jul 10, 2014 at 11:20 AM, Tom Phan <yachtus-apa...@yahoo.com.invalid> wrote: My web server: FreeBSD 10.0, Apache 2.4, Perl 5.16, HTML::Template::Pro 0.9510 > >When I try to run any perl script calling HTML::Template::Pro templates larger >than 8,191 bytes, I get following error in httpd: > >[cgid:error] malformed header from script 'test.pl': Bad header: <!doctype >html> > >Running the script from command line does produce the expected output and no >error, so I am assuming the cause of the error is related to Apache. > > >Here is the simple perl script 'test.pl' that I tested with: > >#!/usr/bin/perl >use strict; >use HTML::Template::Pro; >my $tmpl = HTML::Template::Pro -> new(filename => 'test.tmpl'); >print "Content-Type: text/html\n\n"; >$tmpl -> output(); > >..and the HTML::Template::Pro template 'test.tmpl': > ><!doctype html> ><html> ><body> ><p>blah blah</p> ></body> ></html> > >I ran test.pl in the browser and everything was fine at first, no error. Then >I started adding a lot of blah blahs to the template file until the size of >the template file hit exactly 8,192 bytes, at which time it crashed with a 500 >and with the above error logged in the httpd-error.log. If I delete even a >single character from the template file so it goes below 8K, the script runs >again. I have absolutely no idea why this happens. By the way, large html >files do not crash Apache, nor do Perl scripts printing html code directly >(without HTML::Template::Pro. I tried both to the extreme, creating MBs of >html code and wasn't able to crash anything at all. > >If I switch to mod_cgi instead of mod_cgid, the error appears exactly when template file hits 4K in size. So it is 8K for mod_cgid and 4K for mod_cgi. > >What is it in Apache that imposes such limits on the size of my templates and >how can I lift/increase them? > > >Can you capture the output of the CGI process run under httpd at least up to >the point of the "<!doctype html>" text? I'd guess you are "suffering from buffering" somehow, and the threshhold is a different value with mod_cgid vs mod_cgi. -- Born in Roswell... married an alien... http://emptyhammock.com/
