HTTP::Message

Amoe has asked for the wisdom of the Perl Monks concerning the following question:

I have a script that gets stuff from the web. It sends the "referer" header with its requests, which are accomplished using HTTP::Request and LWP::UserAgent. Most of the time it works fine. But sometimes I get this error: Unexpected field value http://www.referer.com/referer.html at /blah/blah/perl/site/lib/HTTP/Message.pm Since I don't know what line of the program this is getting called at, I'm having trouble pinning down the error. I would use the debugger, but the errors seem to be random. And seeing as line 189 yields a very informative $self->{'_headers'}->$method(@_);, I'm stuck as to how to cure this problem. Any help would be much appreciated.

Comment on HTTP::Message Select or Download Code

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Re (tilly) 1: HTTP::Message by tilly (Archbishop) on Aug 26, 2001 at 02:38 UTC
The _headers object is of class HTTP::Headers. If you look in that class you will find that your error message comes from the _header method. That message would be much more informative if it included the field name, but oh well. To debug further I would suggest adding to your script the line: `use Carp 'verbose';` [download] That won't fix anything, but it will give you a complete stack backtrace into your code, and you can figure out what is going on from there. PS: There is discussion at Are debuggers good? both pro and con on using debuggers for debugging. You might find it an interesting read.	[reply] [d/l]

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Re (tilly) 1: HTTP::Message
by tilly (Archbishop) on Aug 26, 2001 at 02:38 UTC

To debug further I would suggest adding to your script the line:

use Carp 'verbose';
[download]

PS: There is discussion at Are debuggers good? both pro and con on using debuggers for debugging. You might find it an interesting read.

[reply]
[d/l]