beego: filter the static file's url

@@ -138,6 +138,7 @@ func SetStaticPath(url string, path string) *App {
 	if !strings.HasPrefix(url, "/") {
 		url = "/" + url
 	}
+	url = strings.TrimRight(url, "/")
 	StaticDir[url] = path
 	return BeeApp
 }

@@ -306,9 +306,9 @@ func ParseConfig() (err error) {
 			sds := strings.Fields(sd)
 			for _, v := range sds {
 				if url2fsmap := strings.SplitN(v, ":", 2); len(url2fsmap) == 2 {
-					StaticDir["/"+url2fsmap[0]] = url2fsmap[1]
+					StaticDir["/"+strings.TrimRight(url2fsmap[0], "/")] = url2fsmap[1]
 				} else {
-					StaticDir["/"+url2fsmap[0]] = url2fsmap[0]
+					StaticDir["/"+strings.TrimRight(url2fsmap[0], "/")] = url2fsmap[0]
 				}
 			}
 		}