1.    local resptable = {};
2.    local res, statuscode = http.request{
3.       url = external_url,
4.       protocol = "tlsv1_2",
5.       method = "POST",
6.       headers = {
7.          ["content-type"] = "application/x-www-form-urlencoded",
8.          ["content-length"] = #reqbody
9.       },
10.       source = ltn12.source.string(reqbody),
11.       sink = ltn12.sink.table(resptable)
12.    };
13.    local respbody = string.gsub(table.concat(resptable), "\\/", "/")
14.