/etc/varnish/default.vcl - Varnish 4 Working Simple Basic default.vcl | Simple Basic Working VARNISH 4.0 Configuration: default.vcl and varnish.params for a functional web server cache - http://supratim-sanyal.blogspot.com/2016/09/simple-basic-working-varnish-40.html

default.vcl

# --
# /etc/varnish/default.vcl
# Minimal working Varnish 4.0 Configuration to serve static-only website pages from lighttpd backend
# From "Simple Basic Working VARNISH 4.0 Configuration: default.vcl and varnish.params for a functional web server cache"
# http://supratim-sanyal.blogspot.com/2016/09/simple-basic-working-varnish-40.html
# --

vcl 4.0;

backend default {
  .host = "127.0.0.1";
  .port = "65481";
  .connect_timeout = 15s;
    .first_byte_timeout = 30s;
    .between_bytes_timeout = 5s;
    .probe = {
        .request =
            "HEAD / HTTP/1.1"
            "Host: 127.0.0.1:65481"
            "Connection: close";
        .interval = 3600s;      # probe backend every hour
        .timeout = 15s;
        .window = 40;
        .threshold = 38;
        .initial = 38;
        }
}

sub vcl_recv {
  # Uncomment if Redirecting to https.
  #if (req.http.host ~ "^(?i)[wwww\.]?abadcer\.com$" && req.http.X-Forwarded-Proto != "https") {
  #  set req.http.x-redir = "https://" + req.http.host + req.url;
  #  return(synth(850, "Moved permanently"));
  #}

  # do not cache streams or big files for download
  if (req.url ~ "^[^?]*\.(mp[34]|iso|rar|tar|tgz|gz|wav|zip|bz2|xz|7z|avi|mov|ogm|mpe?g|mk[av]|webm)(\?.*)?$") {
    return (pipe);
  }

  # Strip off cookies in request for my static website
  if (req.url ~ "(?i)\.(?:css|gif|html|ico|jpeg|jpg|js|json|png|swf|txt|woff)(?:\?.*)?$") {
    unset req.http.cookie;
  }
}

sub vcl_backend_response {
  # Strip off cookies in response for my static website
  if (bereq.url ~ "(?i)\.(?:css|gif|html|ico|jpeg|jpg|js|json|png|swf|txt|woff)(?:\?.*)?$") {
    unset beresp.http.set-cookie;
  }

  # Enable compression on suitable content types
  if (beresp.http.content-type ~ "(text|javascript|json|plain|xml)") {
  set beresp.do_gzip = true;
  }

  # The returned content is browser-agnostic; strip any http vary indicators in the response
  if (beresp.http.Vary ~ "User-Agent") {
  set beresp.http.Vary = regsuball(beresp.http.Vary, ",? *User-Agent *", "");
  set beresp.http.Vary = regsub(beresp.http.Vary, "^, *", "");
  if (beresp.http.Vary == "") {
    unset beresp.http.Vary;
    }
  }

  # Cache expiry after an hour (The blocklist is updated every hour), but only for normal HTTP responses
  if (beresp.status < 400 ) {
        set beresp.ttl = 60m;
        return(deliver);
        }

} #end vcl_backend_response

# Corresponding to commented out https redirection condition at top
#sub vcl_synth {
#  if (resp.status == 850) {
#    set resp.http.Location = req.http.x-redir;
#    set resp.status = 302;
#    return (deliver);
#  }
#}