gistfile1.c

backend default {
.host = "backendsite";
.port = "80";
  .probe = {
    .url = "/probe.html";
    .timeout = 10 s;
    .interval = 30 s;
    .window = 10;
    .threshold = 8;
    .initial = 10;
  }
}
sub vcl_recv {
  set req.http.Host = "backendsite";

  set req.grace = 1h;

  if (req.request != "GET" &&
    req.request != "HEAD" &&
    req.request != "PUT" &&
    req.request != "POST" &&
    req.request != "TRACE" &&
    req.request != "OPTIONS" &&
    req.request != "DELETE") {
      /* Non-RFC2616 or CONNECT which is weird. */
      return (pipe);
  }

  if (req.request != "GET" && req.request != "HEAD") {
      /* We only deal with GET and HEAD by default */
      return (pass);
  }

  if (req.request == "GET" && req.url ~ "^/cmsdirectory/") {
     error 750 "Moved Temporarily";
  }

  return(lookup);
}

sub vcl_error {
    if (obj.status == 750) {
        set obj.http.Location = "http://backendsite/cmsdirectory/";
        set obj.status = 302;
        return(deliver);
    }
}

sub vcl_fetch {
  if (beresp.ttl < 300s) {
   set beresp.ttl = 300s;
  }
}