Rewrite module

arg_rewrite_mod = rewriter

between the virtual server definition in the yaws.conf file.

For example:

<server localhost>
  port = 8080
  listen = 0.0.0.0
  docroot = /var/www/yaws-default
  arg_rewrite_mod = rewriter
</server>

Below is an example/template of how I managed to get something working. I’m not sure if this is the ‘right’ way to do it however.. Feel free to comment & improve/replace it.

……

-module(rewriter).

-export([arg_rewrite/1]).

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

arg_rewrite(ARG) ->
        Req = ARG#arg.req,
        case Req#http_request.path of
        {abs_path, RawPath} ->
		case (catch yaws_api:url_decode_q_split(RawPath)) of
		{'EXIT', _} -> %%broken request - ignore let yaws_server handle it.
			ARG2 = ARG;
		{DecPath, QueryPart} ->
		 	Parts = string:tokens(DecPath,"/"),	
			case lists:member("viewvc",Parts) of
			true ->
		
				%%
				%Do something with DecPath & QueryPart
				%
				case QueryPart of
				[] ->
					%% Rewritten = SomeNewpath;
				_Other ->
					%% Rewritten = SomeNewpath ++ "?" ++ QueryPart
				end,
				%
				%%	

			  	Req2 = Req#http_request{path = {abs_path, Rewritten}},

				ARG2 = ARG#arg{req = Req2};			
			false -> 		
				ARG2 = ARG
			end	
		end;
        _Else ->
		ARG2 = ARG
        end,	

        ARG2.

……

Great job! I improved the code to make Yaws work with PHP Zend Framework. Go to http://forum.trapexit.org/viewtopic.php?t=14964 for more information. It is quite possible that it will also work for other frameworks (like Cake, for example) – though I haven’t tested it personally.