From 756f9df7e408aa6ae5de29cf5583adea97ba18a2 Mon Sep 17 00:00:00 2001
From: Solderpunk <solderpunk@sdf.org>
Date: Wed, 5 Jun 2019 21:33:57 +0300
Subject: [PATCH] For URLs without trailing slashes which resolve do a
 directory, do a redirect to add the trailing slash.

---
 httphandlers.go | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/httphandlers.go b/httphandlers.go
index 45ee5fa..077962c 100644
--- a/httphandlers.go
+++ b/httphandlers.go
@@ -57,8 +57,15 @@ func GetHandler(config Config) http.HandlerFunc {
 			http.Error(w, "Permission denied.", http.StatusForbidden)
 			return
 		}
-		// Add index.html to directory paths, if it exists
+		// Handle URLS which map to a directory
 		if info.IsDir() {
+			// Redirect to add trailing slash if missing
+			// (otherwise relative links don't work properly)
+			if !strings.HasSuffix(r.URL.Path, "/") {
+				http.Redirect(w, r, r.URL.String()+"/", http.StatusMovedPermanently)
+				return
+			}
+			// Add index.html to directory paths, if it exists
 			index_path := filepath.Join(path, "index.html")
 			index_info, err := os.Stat(index_path)
 			if !os.IsNotExist(err) {