[fix] _ because it is unused

Author: yawnt

lib/http-proxy/passes/web-incoming.js

@@ -89,7 +89,7 @@ web_o = Object.keys(web_o).map(function(pass) {
    * @api private
    */
 
-  function stream(req, res, options, head, server, clb) {
+  function stream(req, res, options, _, server, clb) {
     if(options.forward) {
       // If forward enable, so just pipe the request
       var forwardReq = (options.forward.protocol === 'https:' ? https : http).request(