Get xml source of post result

Hello, everyone:

I am now using www-lib to post some form data to a cgi on the server
side, then get the result from the cgi that returns xml content.
I just want the xml source without parsing it.
But always nothig is returned instead of the xml source.

My program is as the following:

/* start of main */
  ......

  HTChunk * result = NULL;
  HTRequest* request = NULL;
  HTAnchor* anchor = NULL;
  HTAssocList * list = ...; /* form data */
  char* szURL; /* cgi url */
  char* szResult;

  HTProfile_newNoCacheClient("Testing", "1.0");

  HTPrint_setCallback(printer);
  HTTrace_setCallback(tracer);

  HTNet_addAfter(terminate_handler, NULL, NULL, HT_ALL, HT_FILTER_LAST);

  request = HTRequest_new();
  HTRequest_setOutputFormat(request, WWW_SOURCE);
  anchor = HTAnchor_findAddress(szURL);
  result = HTPostFormAnchorToChunk(list, anchor, request);

  HTEventList_loop(request);

  szResult = HTChunk_data(result);
  printf("Result:\n%s\n", szResult); /* here, szResult always seems to
be empty string */

  ......
/* end of main */

PRIVATE int terminate_handler (HTRequest * request, HTResponse * response,
                               void * param, int status)
{
  HTEventList_stopLoop();
  return 0;
}

In fact, the requested cgi is a simple program written in Perl.
(Those dealing with parameters are omitted.)
e.g.

print "Content-type: text/xml\n\n";
print '<?xml version="1.0" encoding="iso-8859-1"?>'."\n";
print '<ROOT>'."\n";
print '<DATA>Hello World</DATA>'."\n";
print '</ROOT>'."\n";

How can I solve this problem?
Any advice is appreciated.

Thanks!

-- 
Xiaobo Bian <[email protected]>