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var temp:tstringlist;

procedure TForm1.IdHTTPProxyServer1BeforeCommandHandler(
  ASender: TIdCmdTCPServer; var AData: string; AContext: TIdContext);
var i:integer;
begin
  if ansipos('POST',adata)=1 then
  begin
    acontext.Connection.IOHandler.ReadStrings(temp);

    temp[temp.Count-1]:='1234';

    for I := 0 to temp.Count - 1 do
      acontext.Connection.IOHandler.WriteLn(temp[i]);
  end;
end;