Get response data size in Loadrunner

For some reason, I need to get response data size for particular web pages. From Loadrunner, there is one simple method to call: web_get_int_property()

it supports:
- HTTP_INFO_RETURN_CODE
- HTTP_INFO_DOWNLOAD_SIZE
- HTTP_INFO_DOWNLOAD_TIME
- HTTP_INFO_TOTAL_REQUEST_STAT
- HTTP_INFO_TOTAL_RESPONSE_STAT

code sample：
...................
web_browser("www.google.com",
DESCRIPTION,
ACTION,
"Navigate=http://www.google.com/",
LAST);

downloadsize=web_get_int_property(HTTP_INFO_DOWNLOAD_SIZE);

lr_log_message("%s,size=%d",lr_eval_string("{username}"),downloadsize);
....................

another input from one's blog:
http://www.cptloadtest.com/2005/05/10/PageSizeMonitorInLoadRunner.aspx
it might useful for you to monitor your page size