Very often a

print Dumper($google)."\n";
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helps. It usually contains the request and the reply.

Not a Perl solution, but when debugging SOAP-crap very often

tcpdump -nXs 8192 -c 1000 port 80 >dump.log
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also helps alot, because you get the raw data stream. You man need to be more specific with the filter conditions depending on the load of your computer.