.. Copyright (c) 2013-2017 Varnish Software AS SPDX-License-Identifier: BSD-2-Clause See LICENSE file for full text of license Adding WebSockets support ------------------------- WebSockets is a technology for creating a bidirectional stream-based channel over HTTP. To run WebSockets through Varnish you need to pipe the request and copy the Upgrade and Connection headers as follows:: sub vcl_recv { if (req.http.upgrade ~ "(?i)websocket") { return (pipe); } } sub vcl_pipe { if (req.http.upgrade) { set bereq.http.upgrade = req.http.upgrade; set bereq.http.connection = req.http.connection; } }