fixed #701

Signed-off-by: Vishal Rana <vr@labstack.com>

echo.go

@@ -121,6 +121,11 @@ type (
 
 	// Map defines a generic map of type `map[string]interface{}`.
 	Map map[string]interface{}
+
+	// i is the interface for Echo and Group.
+	i interface {
+		GET(string, HandlerFunc, ...MiddlewareFunc)
+	}
 )
 
 // HTTP methods
@@ -384,14 +389,18 @@ func (e *Echo) Match(methods []string, path string, handler HandlerFunc, middlew
 // Static registers a new route with path prefix to serve static files from the
 // provided root directory.
 func (e *Echo) Static(prefix, root string) {
+	static(e, prefix, root)
+}
+
+func static(i i, prefix, root string) {
 	h := func(c Context) error {
 		return c.File(path.Join(root, c.Param("*")))
 	}
-	e.GET(prefix, h)
+	i.GET(prefix, h)
 	if prefix == "/" {
-		e.GET(prefix+"*", h)
+		i.GET(prefix+"*", h)
 	} else {
-		e.GET(prefix+"/*", h)
+		i.GET(prefix+"/*", h)
 	}
 }
 

group.go

@@ -85,7 +85,7 @@ func (g *Group) Group(prefix string, middleware ...MiddlewareFunc) *Group {
 
 // Static implements `Echo#Static()` for sub-routes within the Group.
 func (g *Group) Static(prefix, root string) {
-	g.echo.Static(g.prefix+prefix, root)
+	static(g, prefix, root)
 }
 
 // File implements `Echo#File()` for sub-routes within the Group.