flowchart TB
  subgraph principal["Contexte principal : user, worker_processes, pid"]
    subgraph ev["events"]
      evd["worker_connections"]
    end
    subgraph ht["http : tout le trafic web"]
      hd["log_format, include mime.types, gzip"]
      subgraph sv["server : un site, choisi par listen et server_name"]
        sd["root, ssl_certificate, error_page"]
        subgraph lo["location : un chemin d'URL"]
          ld["try_files, proxy_pass, return"]:::accent
        end
      end
    end
  end