example 1: manual proxy at port 8080 and output result to screen
wget -O- -e http_proxy=proxy1.somedomain.com:8080 http://www.google.com.sg
example 2: for https proxy
for HTTPS
wget --no-check-certificate -e use_proxy=yes -e https_proxy=1.2.3.4:8080 https://www.example.com