;) found the problem ... if you remove the:
<cfhttpparam type="header" name="Content-Length"
value="#len(trim(xmlPostageLabelRequest))#">
then it all works. You are overriding the length of the outgoing
request which is not accounting for the extra characters for encoding.
Very rarely you should set this manually, and just leave it to the
underlying library to manage that for you.
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