easy:SetOpt_ProxyHeader(headers)
#CURLOPT_HTTPHEADER
option's.
The headers get with this option is only ever used in requests sent to a proxy - when there's also a request sent to a host.
The first line in a request (containing the method, usually a GET or POST) is NOT a header and cannot be replaced using this option. Only the lines following the request-line are headers. Adding this method line in this list of headers will only cause your request to send an invalid header.
Pass a Nil
to this to reset back to no custom headers.