Fix error handling in renderStatic

Fixes #60

router.go

@@ -82,12 +82,13 @@ func (w *statusResponseWriter) WriteHeader(statusCode int) {
 }
 
 // CreateMainRouter creates the main Gorilla router for the application.
-func CreateMainRouter(rl *rushlink, debug bool) *mux.Router {
+//
+// This function will not populate the  router with an error-recovery and
+// metrics-reporting middleware. If these middleware are required, then the
+// caller should encapsulate this router inside of another router and register
+// the middlewares on the encapsulating router.
+func CreateMainRouter(rl *rushlink) *mux.Router {
 	router := mux.NewRouter()
-	if !debug {
-		router.Use(rl.recoveryMiddleware)
-		router.Use(rl.metricsMiddleware)
-	}
 	router.HandleFunc("/{path:img/"+staticFilenameExpr+"}", rl.staticGetHandler).Methods("GET", "HEAD")
 	router.HandleFunc("/{path:css/"+staticFilenameExpr+"}", rl.staticGetHandler).Methods("GET", "HEAD")
 	router.HandleFunc("/{path:js/"+staticFilenameExpr+"}", rl.staticGetHandler).Methods("GET", "HEAD")
@@ -122,8 +123,13 @@ func StartMainServer(addr string, db *db.Database, fs *db.FileStore, rawRootURL
 		rootURL: rootURL,
 	}
 
+	router := mux.NewRouter()
+	router.Use(rl.metricsMiddleware)
+	router.Use(rl.recoveryMiddleware)
+	router.Handle("/", CreateMainRouter(&rl))
+
 	srv := &http.Server{
-		Handler:      CreateMainRouter(&rl, false),
+		Handler:      router,
 		Addr:         addr,
 		WriteTimeout: 15 * time.Second,
 		ReadTimeout:  15 * time.Second,