couch_httpd.erl

start_link(Name, Options0) ->
    Options = case couch_config:get("httpd", "extra_opts") of
    undefined -> Options0;
    StrOpts ->
        try
            {ok, Tokens, _} = erl_scan:string(StrOpts),
            {ok, Options1} =  erl_parse:parse_term(Tokens),
            Options0 ++ Options1
        catch
        _Err:Msg -> 
            throw({error, bad_httpd_extra_opts})
        end
    end,

local_dev.ini

[httpd]
extra_opts = [{backlog, 2048}].