Proxy varnish ghost blog engine on redhat openshift

default-openshift-ghost.vcl

backend default {
    .host = "app.rhcloud.com";
    .port = "80";
}


sub vcl_recv {
    set req.http.host = "app.rhcloud.com";

    if (req.http.cache-control ~ "no-cache") {
        set req.hash_always_miss = true;
    }

    set req.http.x-pass = "false";

    if (req.url ~ "^/(api|signout)") {
        set req.http.x-pass = "true";
    } elseif (req.url ~ "^/ghost" && (req.url !~ "^/ghost/(img|css|fonts)")) {
        set req.http.x-pass = "true";
    }

    if (req.http.x-pass == "true") {
        return(pass);
    }
    unset req.http.cookie;
}

sub vcl_fetch {
    if (req.http.x-pass != "true") {
        unset beresp.http.set-cookie;
        if (beresp.status < 500 && beresp.ttl == 0s) {
            set beresp.ttl = 2m;
        }
    }
}