Function defaultWebServer

internal/driver/webui.go:185–217

(args *plugin.HTTPServerArgs)

	return host, port, nil
}
func defaultWebServer(args *plugin.HTTPServerArgs) error {
	ln, err := net.Listen("tcp", args.Hostport)
	if err != nil {
		return err
	}
	isLocal := isLocalhost(args.Host)
	handler := http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
		if isLocal {
			// Only allow local clients
			host, _, err := net.SplitHostPort(req.RemoteAddr)
			if err != nil || !isLocalhost(host) {
				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:
	//
	// https://github.com/google/pprof/pull/348
	mux := http.NewServeMux()
	mux.Handle("/ui/", http.StripPrefix("/ui", handler))
	mux.Handle("/", redirectWithQuery("/ui", http.StatusTemporaryRedirect))
	s := &http.Server{Handler: mux}
	return s.Serve(ln)
}

// redirectWithQuery responds with a given redirect code, preserving query
// parameters in the redirect URL. It does not convert relative paths to