Usage http.server as plugin after error about gopher-lua-libs

[vadv]

good case, i will check it.
as workaround, I can suggest pcall() when processing a handler.

[vadv]

in branch master now there are commits which stop the internal net.Listener on p:stop():

  if not server:is_running() then
    print("error:", tostring(server:error()))
    server:stop() -- close tcp listener
    server:run() -- now plugin bind tcp port successfully 
  end