print $client->responseHeader("Content-Length") < 56 ?
    "Empty\n" : "Something...\n";

[download]

56 is a guess, the XML string you said is an empty payload is 55 but it might have a new line or something too. :P If the Content-Length header is not in the XML you can do the same length check on the body. This would be faster but likely not as robust as checking the XML.

In reply to Re: How might one determine empty XML payload? by Your Mother
in thread How might one determine empty XML payload? by vlturner

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