Medium article about WebSockets throughout Varnish - user.vcl 1

user.vcl

vcl 4.1;

backend default {
    .host = "web-client";
    .port = "80";
}

backend productService {
    .host = "product-service";
    .port = "8080";
}

sub vcl_recv {
    if (req.url == "/product" || req.url == "/ws") {
        set req.backend_hint = productService;
    } 
}