>
> Unfortunately, I do not have LWT::Simple, and there is no
> chance I can use it (I am not authorized to modify Perl
> directory).
>

You can install additional modules in your home directory without writing anything to the perl directory.

Create a "perllib" directory in your home, grab and unpack the .tar.gz source of LWP and build it with:

perl Makefile.PL PREFIX=$HOME/perllib LIB=$HOME/perllib
make
make install
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If you want to use CPAN, you can use it by adding 'PREFIX=/home/yourhome/perllib LIB=/home/yourhome/perllib' when CPAN configurator ask you for additionnal parameters for Makefile.PL
Then you should be able to directly build and install the LWP module with:

perl -MCPAN -e 'install LWP'
[download]

So, now the module files should be in your "perllib" dir.
Now you need to tell Perl that there is a new directory that contain modules by adding this directory to the PERL5LIB variable:

export PERL5LIB=$PERL5LIB:$HOME/perllib
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And it should work ...

(perlmodinstall may also help)