Makes the dev file built more gulp-ish way

main.go

@@ -27,6 +27,7 @@ type Options struct {
 	RequestWindow time.Duration `long:"request-window" description:"Window over which no more --max-request are done"`
 	CacheTTL      time.Duration `long:"chache-ttl" description:"TTL of the cached data" `
 	BatchSize     int           `long:"batch-size" description:"Sizes of the batch for indexing" default:"1000"`
+	BasePath      string        `long:"basepath" short:"b" description:"basepath of the webapp" default:"dist/prod"`
 }
 
 type appData struct {
@@ -378,7 +379,7 @@ func Execute() error {
 
 	log.Printf("Listening on %s", opts.Listen)
 	a.start(srv.StopChan())
-	srv.Server.Handler = a.buildRouter()
+	srv.Server.Handler = a.buildRouter(opts.BasePath)
 	if err := srv.ListenAndServe(); err != nil {
 		if opErr, ok := err.(*net.OpError); !ok || (ok && opErr.Op != "accept") {
 			return err