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It should work the same. Try using the debug() to see what is occurring.
var a = conversation.getLast(#input, 1).input;
debug(a);
var s = a.substring(3,a.size());
The debug will be printed to the log in chat if you click on the "debug" checkbox while chatting and select FINE as the level.
Also try ensuring it is a string.
a = a.toString();
var s = a.substring(3, a.size());
For an HTTP POST request use,
(XML)
Http.postXML(url, xmlObject);
or, (JSON)
Http.postJSON(url, jsonObject);
or, (form params)
Http.postHTML(url, params);
See,
https://www.botlibre.com/manual-self.jsp#http
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