Automatic HTTP OPTIONS for Expressjs routes... place after all other routes. Doesn't fully conform to the protocol spec per: http://www.w3.org/Protocols/rfc2616/rfc2616-sec9.html w/r/t the `Max-Forwards` header. Would also like to add helper to automagically render a response body per: http://zacstewart.com/2012/04/14/http-options-method.html ..…

gistfile1.js

 app.options('*', function (req, res) {
   var path = req.originalUrl;
   var allow = [];
 
   for (var opt in app.routes) app.routes[opt].forEach(findRoutes);
 
   function findRoutes (route) {
     if (path.match(route.regexp)) allow.push(opt.toUpperCase());
   }
 
   if (allow.length === 1) return res.send(404); // means its only OPTIONS
 
   res.header('Allow', allow.join(','));
   res.send(200);
 
 });

https://developers.helloreverb.com/swagger/ for the response body maybe?