#-e This is a basic VCL configuration file for varnish.  See the vcl(7)
#man page for details on VCL syntax and semantics.
vcl 4.0;

backend default {
 .host = "127.0.0.1";
 .port = "80";
}

# weasel's rule:
sub vcl_recv {
 if (req.http.Cache-Control ~ "(?i)no-cache") {
   # Ignore requests via proxy caches and badly behaved crawlers
   if (! (req.http.Via || req.http.User-Agent ~ "(?i)bot" || req.http.X-Purge)) {
      return(purge); # Couple this with restart in vcl_purge and X-Purge header to avoid loops
   }
 }
}

sub vcl_purge {
  # Only handle actual PURGE HTTP methods, everything else is discarded
  if (req.method != "PURGE") {
    # restart request
    set req.http.X-Purge = "Yes";
    return(restart);
  }
}

# We rate-limit requests by clients.
#  Currently, we do that at the netfilter level, so one
#  request per connection works best.
sub vcl_deliver {
  if (remote.ip != "127.0.0.1" &&
      remote.ip != "::1") {
    set resp.http.connection = "close";
  }
}

sub vcl_backend_response {
    if (bereq.retries == 0 &&
        beresp.status == 302 &&
        beresp.http.location ~ "https?://[^/]*/file/") {
        set beresp.http.location = regsub(beresp.http.location,"^https?://","");
        set bereq.http.host = regsub(beresp.http.location,"/.*$","");
        set bereq.url = regsub(beresp.http.location,"[^/]*","");
        return (retry);
    }
}