<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 TRANSITIONAL//EN"> <HTML> <HEAD> <META HTTP-EQUIV="Content-Type" CONTENT="text/html; CHARSET=UTF-8"> <META NAME="GENERATOR" CONTENT="GtkHTML/4.8.5"> </HEAD> <BODY> I am trying to write a middleware step that will modify the URL in a request before it gets to the default static request handler. I can not find an example of how to do this. What I　have so far: execute( Req, Env ) -> HostUrl = cowboy_req:host_url(Req), NewUrl = rewrite( HostUrl ), NewReq = ??? {ok, NewReq, Env}. How do I modify a Request object so that it contains my modified URL, which cowboy_static will then process normally? My 'rewrite' function converts logical directory names into real file-system paths, using a dynamic algorithm that can not be simply written into cowboy's dispatch rules. The dispatch rules I am using is as follows, where 'bz_libmap' is my module containing the code above: {"/music/[...]", cowboy_static, {dir, bz_libmap, ""}}, </BODY> </HTML>