diff --git a/main.go b/main.go
index 8fd0aaf..b8a1417 100644
--- a/main.go
+++ b/main.go
@@ -352,6 +352,7 @@ func beforeProxy(next http.HandlerFunc) http.HandlerFunc {
 		}
 
 		if req.Method != "GET" && req.Method != "HEAD" {
+			w.WriteHeader(405)
 			io.WriteString(w, "Only GET and HEAD requests are allowed.")
 			return
 		}