Fix https://github.com/kataras/iris/issues/351

sessions.go

@@ -332,7 +332,8 @@ func (m *sessionsManager) start(ctx *Context) *session {
 	if cookieValue == "" { // cookie doesn't exists, let's generate a session and add set a cookie
 		sid := m.generateSessionID()
 		session = m.provider.init(sid)
-		cookie := fasthttp.AcquireCookie()
+		//cookie := fasthttp.AcquireCookie() strange errors when c.SetFlash (old)
+		cookie := &fasthttp.Cookie{}
 		// The RFC makes no mention of encoding url value, so here I think to encode both sessionid key and the value using the safe(to put and to use as cookie) url-encoding
 		cookie.SetKey(m.config.Cookie)
 		cookie.SetValue(sid)
@@ -376,7 +377,6 @@ func (m *sessionsManager) start(ctx *Context) *session {
 		} // if it's -1 then the cookie is deleted when the browser closes
 
 		ctx.SetCookie(cookie)
-		fasthttp.ReleaseCookie(cookie)
 	} else {
 		session = m.provider.read(cookieValue)
 	}