ext: Only append extension if request is not for directory (fixes #173)

dist/CHANGES.txt

@@ -6,6 +6,7 @@ CHANGES
 - browse: Sort by clicking column heading or using query string
 - core: Serving hostname that doesn't resolve issues warning then listens on 0.0.0.0
 - errors: Missing error page during parse time is warning, not error
+- ext: Extension only appended if request path does not end in /
 - fastcgi: Fix for backend responding without status text
 - fastcgi: Fix PATH_TRANSLATED when PATH_INFO is empty (RFC 3875)
 - gzip: Enable by file path and/or extension

middleware/extensions/ext.go

@@ -31,7 +31,7 @@ type Ext struct {
 // ServeHTTP implements the middleware.Handler interface.
 func (e Ext) ServeHTTP(w http.ResponseWriter, r *http.Request) (int, error) {
 	urlpath := strings.TrimSuffix(r.URL.Path, "/")
-	if path.Ext(urlpath) == "" {
+	if path.Ext(urlpath) == "" && r.URL.Path[len(r.URL.Path)-1] != '/' {
 		for _, ext := range e.Extensions {
 			if resourceExists(e.Root, urlpath+ext) {
 				r.URL.Path = urlpath + ext