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       Or you can process the document as it arrives (second
       $ua->request() argument is a code reference):
...
                          # print $chunk;
                      });
          print $res->status_line, "\n";

       The subroutine variant requires a reference to callback 
       routine as the second argument to the request method and 
...
       The request can be aborted by calling die() in the call- 
       back routine.  The die message will be available as the 
       "X-Died" special response header field.