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Bug: Multiple Content-Type Headers output by TWiki

All pages return a duplicate Content-Type header. Browsers intermittently display header information, which is mildly irritating but not a showstopper. (Still worthy of a bug report though.) However, feedreaders trying to grab RSS will get stopped in their tracks since the resulting document won't parse.

Test case

GET -e http://openinteract.sourceforge.net/cgi-bin/twiki/view/ produces: 

Connection: close
Date: Wed, 22 Jan 2003 21:10:18 GMT
Server: Apache/1.3.26 (Unix) PHP/4.1.2
Content-Type: text/html
Client-Date: Wed, 22 Jan 2003 21:24:58 GMT
Client-Peer: 66.35.250.209:80
Client-Response-Num: 1
Client-Transfer-Encoding: chunked
Set-Cookie: twikisession=1043269819-369606; path=/cgi-bin/twiki/view

Content-Type: text/html; charset=ISO-8859-1

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" ....

The last Content-Type:... line is the culprit.

I do not think this is a server/configuration problem because

GET -e http://openinteract.sourceforge.net/cgi-bin/twiki/echo produces: 

Connection: close
Date: Wed, 22 Jan 2003 21:18:23 GMT
Server: Apache/1.3.26 (Unix) PHP/4.1.2
Content-Type: text/plain
Client-Date: Wed, 22 Jan 2003 21:33:00 GMT
Client-Peer: 66.35.250.209:80
Client-Response-Num: 1
Client-Transfer-Encoding: chunked

And your headers are...

echo is a simple Perl script to dump the environment, using CGI.pm to ensure it's not a library problem: 

#!/usr/bin/perl 
 
use strict; 
use CGI; 
 
my $q = new CGI; 
print $q->header( -content_type => 'text/plain' ); 
print "And your headers are...\n"; 
while ( my ( $key, $value ) = each %ENV ) { 
        print "$key = $value\n"; 
} 
print "All done!\n";

Environment

TWiki version: 20021230
TWiki plugins: DefaultPlugin, GaugePlugin, GnuSkinPlugin, InterwikiPlugin, PerlDocPlugin, SessionPlugin, TigerSkinPlugin, TreePlugin (GnuSkin is active)
Server OS: Linux 2.4.18
Web server: Apache 1.3.26
Perl version: 5.6.1
Client OS: Linux 2.4.19
Web Browser: Mozilla, IE, command-line fetch

-- ChrisWinters - 22 Jan 2003

Follow up

Thanks for providing a very clear bug report with all the details needed!

This is a bug in SessionPlugin, I believe - it needs updating to use the BeijingRelease plugin API. Plugins should not print any headers directly, but instead should just use the API so that the core can generate mandatory headers - this is required by the fix for BackFromPreviewLosesText. I put a patch to fix this problem on SessionPluginDev some time ago (the 'fix for plugin API' patch), but it may not have been applied to the core code. This plugin should note the Plugin API version and use the appropriate header API if appropriate - see writeHeaderHandler in MorePluginHooks.

It would also be useful IMO to turn off most or all plugins when generating RSS feeds - this is something that has come up already.

-- RichardDonkin - 23 Jan 2003

Applying the patch did the trick -- thanks!

-- ChrisWinters - 23 Jan 2003

Fix record

WebForm
TopicClassification BugRejected
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Topic revision: r3 - 2003-01-23 - ChrisWinters
 
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