vcl 4.1;

import brotli;

# Default backend definition. Set this to point to your content server.
backend default {
    .host = "127.0.0.1";
    .port = "8080";
}

sub vcl_recv {
    # Happens before we check if we have this in cache already.
    #
    # Typically you clean up the request here, removing cookies you don't need,
    # rewriting the request, etc.
    
    if(req.http.Accept-Encoding ~ "br" && req.url !~
            "\.(jpg|png|gif)$") {
        set req.http.X-brotli = "true";
    }
}


sub vcl_hash
{
    if(req.http.X-brotli == "true") {
        hash_data("brotli");
    }
}

sub vcl_backend_fetch
{
    if(bereq.http.X-brotli == "true") {
        set bereq.http.Accept-Encoding = "br";
        unset bereq.http.X-brotli;
    }
}

sub vcl_backend_response {
    # Happens after we have read the response headers from the backend.
    #
    # Here you clean the response headers, removing silly Set-Cookie headers
    # and other mistakes your backend does.
}

sub vcl_deliver {
    # Happens when we have all the pieces we need, and are about to send the
    # response to the client.
    #
    # You can do accounting or modifying the final object here.
}