Cedexis test objects local in Varnish Cache

cedexis.vcl

/*
 * Cedexis test object location: L34, L39
 *
 * Requires vmod null:
 * https://github.com/varnish/libvmod-null
 *
 */

vcl 4.0;

import std;
import null;

backend default
{
  .host = "0.0.0.0";
  .port = "80";
}

sub vcl_recv
{
  if (req.url == "/cedexis/r20.gif") {
    return (synth(781));
  } else if (req.url == "/cedexis/r20-100KB.png") {
    return (synth(782));
  }
}

sub vcl_synth
{
  if (resp.status == 781) {
    set resp.status = 200;
    set resp.http.Content-Type = "image/gif";
    null.synth(std.fileread("/some/path/r20.gif"), 43);
    return (deliver);
  } else if (resp.status == 782) {
    set resp.status = 200;
    set resp.http.Content-Type = "image/png";
    null.synth(std.fileread("/some/path/r20-100KB.png"), 102400);
    return (deliver);
  }
}