gistfile1.txt

sub vcl_recv {
    if (req.url ~ "^/api/*") {
        unset req.http.cookie;
        unset req.http.cache - control;
        unset req.http.pragma;
        unset req.http.expires;
        unset req.http.etag;
        unset req.http.X - Forwarded - For;
        if (req.restarts == 0) {
            set req.http.X - host = req.http.host;
            set req.backend = s3;
            set req.http.host = "tests3bucket.amazonaws.com";
            return(lookup);
        } else {
            set req.backend = default;
            set req.http.host = req.http.X - host;
            return(lookup);
        }
    }
}