anchor.diff:          static([<<"api">>], [{file, <<"api/index.html">>}]),
   
           %% /api/* requests
  -        {[<<"api">>, '...'], vanguard_handler, []},
  +        {[<<"api">>, '...'], vanguard_handler, Backends},
   
           %% Static files under ./priv/www
           static(['...'])
  
positive.code:     {Match, cowboy_http_static,
          [{directory, {priv_dir, vanguard, [<<"www">>]}},
           {mimetypes, {fun mimetypes:path_to_mimes/2, default}},
           {etag, {attributes, [filepath, filesize, inode, mtime]}}|Opts]}.
  
negative.code: %% @private
  tcp_options(Config) ->
      [{ip, vanguard_config:option(ip, Config)},
       {port, vanguard_config:option(port, Config)}|
       vanguard_config:env(tcp)].
  
  -spec routes() -> [_].
  %% @private
  routes() ->
      Backends = vanguard_config:env(backends),
      [{'_', [
          %% / -> ./priv/www/index.html
          static([], [{file, <<"index.html">>}]),
  