I'm not real sure about your $ENV problem, but using CGI.pm i can do the following: 
#!/usr/bin/perl -w

use CGI;
use strict;

print $q->header, $q->url(-absolute=>1, -path=>1, -query=>1);

[download]
I added ?file_url=//testdoc_dir/t1.txt&file_path=/u02/data/doc/test/t1.txt&43368 to the end of the URL which produced the following output: 
/cgi-bin/temp/self.cgi?file_url=%2F%2Ftestdoc_dir%2Ft1.txt&file_path=%
+2Fu02%2Fdata%2Fdoc%2Ftest%2Ft1.txt

[download]
HTH

Update: got rid of s/// and used the url method with some extra params. Also, you'll note that &43368 gets thrown away. adding an equals sign afterwards seems to keep it. *shrug*

Alternatively, you might write: 
print $q->url(-absolute=>1, -path=>1), '?', $ENV{QUERY_STRING};

[download]
Which gives (note: unescaped URL) 
/cgi-bin/temp/self.cgi?file_url=//testdoc_dir/t1.txt&file_path=/u02/da
+ta/doc/test/t1.txt&43368

[download]


--
Rock is dead. Long live paper and scissors!

In reply to Re: REQUEST_URI from $ENV gets truncated by LTjake
in thread REQUEST_URI from $ENV gets truncated by Justudo

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