// If l is nil, Serve accepts connections from os.Stdin.
// If handler is nil, [http.DefaultServeMux] is used.
func Serve(l net.Listener, handler http.Handler) error {
	if l == nil {
		var err error
		l, err = net.FileListener(os.Stdin)
		if err != nil {
			return err
		}
		defer l.Close()
	}
	if handler == nil {
		handler = http.DefaultServeMux
	}
	for {
		rw, err := l.Accept()
		if err != nil {
			return err

	// should handle internal redirects when the CGI process
	// returns a Location header value starting with a "/", as
	// specified in RFC 3875 § 6.3.2. This will likely be
	// http.DefaultServeMux.
	//
	// If nil, a CGI response with a local URI path is instead sent
	// back to the client and not redirected internally.
	PathLocationHandler http.Handler
}

func (h *Handler) stderr() io.Writer {

		1, 4, 0, 1, 0, 10, 0, 0, 50, 50, 3, 4, 5, 6, 7, 8, 9, 10,
		// end of params
		1, 4, 0, 1, 0, 0, 0, 0,
	}
	rw := rwNopCloser{bytes.NewReader(input), io.Discard}
	c := newChild(rw, http.DefaultServeMux)
	c.serve()
}

// a series of FastCGI records that start and end a request
var streamFullRequestStdin = bytes.Join([][]byte{
	// set up request
	makeRecord(typeBeginRequest, 1,

				http.Error(w, "permission denied", http.StatusForbidden)
				return
			}
		}
		h := args.Handlers[req.URL.Path]
		if h == nil {
			// Fall back to default behavior
			h = http.DefaultServeMux
		}
		h.ServeHTTP(w, req)
	})

	// We serve the ui at /ui/ and redirect there from the root. This is done
	// to surface any problems with serving the ui at a non-root early. See:
	//

//
// By default, all the profiles listed in [runtime/pprof.Profile] are
// available (via [Handler]), in addition to the [Cmdline], [Profile], [Symbol],
// and [Trace] profiles defined in this package.
// If you are not using DefaultServeMux, you will have to register handlers
// with the mux you are using.
//
// # Parameters
//
// Parameters can be passed via GET query params:
//