papertrail-fastly-vcl.vcl

# Called at the beginning of a request, after the complete request has been received and parsed
sub vcl_recv {
#FASTLY recv

  if (req.request != "HEAD" && req.request != "GET" && req.request != "FASTLYPURGE") {
    return(pass);
  }

  return(lookup);
}

# Used to alter the response headers, trigger ESI processing, or try alternate backend servers in case the request failed
sub vcl_fetch {
#FASTLY fetch

  if ((beresp.status == 500 || beresp.status == 503) && req.restarts < 1 && (req.request == "GET" || req.request == "HEAD")) {
    restart;
  }

  if(req.restarts > 0 ) {
    set beresp.http.Fastly-Restarts = req.restarts;
  }

  if (beresp.http.Set-Cookie) {
    set req.http.Fastly-Cachetype = "SETCOOKIE";
    return (pass);
  }

  if (beresp.http.Cache-Control ~ "private") {
    set req.http.Fastly-Cachetype = "PRIVATE";
    return (pass);
  }

  if (beresp.status == 500 || beresp.status == 503) {
    set req.http.Fastly-Cachetype = "ERROR";
    set beresp.ttl = 1s;
    set beresp.grace = 5s;
    return (deliver);
  }

  if (beresp.http.Expires || beresp.http.Surrogate-Control ~ "max-age" || beresp.http.Cache-Control ~"(s-maxage|max-age)") {
    # keep the ttl here
  } else {
    # apply the default ttl
    set beresp.ttl = 3600s;
  }

  return(deliver);
}

# Called after an object has been found (hit) in the cache
sub vcl_hit {
#FASTLY hit

  if (!obj.cacheable) {
    return(pass);
  }
  return(deliver);
}

# Called after an object was not found in the cache
sub vcl_miss {
#FASTLY miss

  return(fetch);
}

# Used to add and/or remove headers
sub vcl_deliver {
#FASTLY deliver

  unset resp.http.X-Log-Message;
}

# Generates content from within Varnish, without talking to a web server
sub vcl_error {
#FASTLY error
}

# Called after a pass in vcl_recv, or after a lookup that returned a hit pass
sub vcl_pass {
#FASTLY pass
}