How to fetch HTTP headers in perl when using CGI

Question

I'm using Perl/CGI/Apache and want to fetch the X-Forwarded-For HTTP header. How do I do that?

cjm · Accepted Answer · 2011-02-09 19:27:03Z

16

Except for a few headers that are handled specially, CGI stores the value of Header-Name: in the environment variable HTTP_HEADER_NAME. So, X-Forwarded-For (if present in the request) should be found in $ENV{HTTP_X_FORWARDED_FOR}.

answered Feb 9, 2011 at 19:27

cjm

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2 Comments

http8086 Over a year ago

@cjm, thank you so much. Is there any rfc or protocol or standard defines, web server passes http header to cgi process in environment variables way with prefix HTTP_?

cjm Over a year ago

@hylepo, RFC 3875

Rup · Accepted Answer · 2012-10-05 09:39:03Z

5

CGI has a method for accessing HTTP request header fields, called "http", so you can say:

my $q = CGI->new()
print $q->http('X-Forwarded-For');

This works regardless whether you're running as a CGI, in fastcgi, mod_perl, etc...

edited Oct 5, 2012 at 9:39

Rup

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answered Mar 7, 2012 at 13:31

mephinet

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