Present usage on empty path.

1 files changed, 10 insertions, 1 deletions

diff --git a/main.go b/main.go
index 1b93d8d..402ec8f 100644
--- a/main.go
+++ b/main.go
@@ -105,7 +105,16 @@ func (h handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 	if r.URL.Path == "/favicon.ico" {
 		return
 	}
+
+	if r.URL.Path == "/" {
+		http.Error(w, fmt.Sprintf("usage: %s/@facebookGroupName", r.Host), 400)
+		return
+	}
+
 	group := r.URL.Path[1:]
+	if group[0] == '@' {
+		group = group[1:]
+	}
 	if strings.HasSuffix(group, ".rss") {
 		group = strings.TrimSuffix(group, ".rss")
 		outputMode = "rss"
@@ -121,7 +130,7 @@ func (h handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 		}
 
 		if c == nil || len(c.Items) < 1 {
-			http.Error(w, fmt.Sprintf("%s", "group not found"), 400)
+			http.Error(w, fmt.Sprintf("%s", "Group not found."), 400)
 			return
 		}