How to rewrite URL in Yaws/Erlang

Question

How can I access yaws file without including it's extension? Say,

www.domain.com/listen.yaws => www.domain.com/listen

I could not find any specific documentation for this from yaws documentation/appmod.

I think the question is ultimately clarified!

score 5 · Accepted Answer · answered Jul 30 '16 at 01:39

You can find one example of how to accomplish this in the "Arg Rewrite" section (7.1.2) of the Yaws PDF documentation. Set the variable arg_rewrite_mod in your server configuration to the name of an Erlang module supporting rewriting:

arg_rewrite_mod = my_rewriter

To support rewriting, the my_rewriter module must define and export an arg_rewrite/1 function, taking an #arg{} record as its argument:

-module(my_rewriter).
-export([arg_rewrite/1]).

-include_lib("yaws/include/yaws_api.hrl").

rewrite_pages() ->
    ["/listen"].

arg_rewrite(Arg) ->
    Req = Arg#arg.req,
    {abs_path, Path} = Req#http_request.path,
    case lists:member(Path, rewrite_pages()) of
        true ->
            Arg#arg{req = Req#http_request{path = {abs_path, Path++".yaws"}}};
        false ->
            Arg
    end.

The code includes yaws_api.hrl to pick up the #arg{} record definition.

The rewrite_pages/0 function returns a list of pages that must be rewritten to include ".yaws" suffixes; in this example, it's just the /listen page you mention in your question. If in arg_rewrite/1 we find the requested page in that list, we append ".yaws" to the page name and include it in a new #arg{} we return to Yaws, which then continues dispatching the request based on the new #arg{}.

How to rewrite URL in Yaws/Erlang

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