Usefull script  to check if a proxy is alive.

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#!/bin/bash
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# HTTP Proxy Server's IP Address (or URL)
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proxy_server=$1
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# HTTP Proxy Server's Port Number
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port=$2
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# We're trying to reach this url via the given HTTP Proxy Server
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# (http://www.google.com by default)
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url="http://www.google.com"
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# Timeout time (in seconds)
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timeout=20
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# We're fetching the return code and assigning it to the $result variable
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result=`HEAD -d -p http://$proxy_server:$port -t $timeout $url`
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# If the return code is 200, we've reached to $url successfully
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if [ "$result" = "200 OK" ]; then
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    echo "1 (proxy works)"
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