filename in "u:\prochttp\Testware\ProxyAuthTest_in";
filename out "u:\prochttp\Testware\ProxyAuthTest_out.txt";
data _null_;
   file in;
   input;
   put _infile_;
   datalines4;
appid=restbook&query=jellyfish
;;;;

proc http
   in=in
   out=out
   url="http://api.search.yahoo.com/WebSearchService/V1/webSearch?"
   method="post"
   ct="application/x-www-form-urlencoded"
   proxyhost="proxyhost.company.com"
   proxyusername="your-user-name"
   proxypassword="your-password"
   proxyport=80;
run;