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Id: 30579
Status: resolved
Priority: 0/
Queue: libwww-perl

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Owner: Nobody in particular
Requestors: simonw [...] zynet.net
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Subject: HTTP::Headers If-Modified-Since and IE6
Date: Thu, 8 Nov 2007 18:39:38 +0100
To: bug-libwww-perl [...] rt.cpan.org
From: Simon Waters <simonw [...] zynet.net>
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IE6 appends "; length = NNNN" to the HTTP date in "If-Modified-Since" headers. This is not handled gracefully by the "if_modified_since" function of HTTP::Headers v1.64. It appears to be an RFC infringement by IE6, possibly predating the current RFC. A quick search suggests Netscape (Navigator - presumably?) did this once?! The fix is trivial, so I'm guessing either no one noticed, or it is a policy not to fix it, or there is some other reason. Revealed for us by Catalyst::Plugin::Static.pm serve_static_file subroutine, which stats the file to the served, checks the If-Modified-Since header exists, and then tries to use "if_modified_since" in a comparison (without first checking it returned a value). Resulting in excess shipping of files for IE6, for people with Perl webservers for static content that used HTTP::Headers and didn't work around this.
Patched LWP to ignore any params when evaluating any of the date header methods.
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