You don't need to use a proxy. Google's probably just validating against your User Agent. Change the User Agent that is being sent with the request and you'll be fine.
Tried curl and sent the following:
curl_setopt( $ch, CURLOPT_USERAGENT, "Mozilla/5.0 (Windows; U; Windows NT 5.1; rv:1.7.3) Gecko/20041001 Firefox/0.10.1" );
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