[fix] let user make the decision on what to do with the buffer

Author: jcrugzz

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

@@ -113,7 +113,6 @@ web_o = Object.keys(web_o).map(function(pass) {
 
     // Error Handler
     proxyReq.on('error', function(err){
-      if(options.buffer) { options.buffer.destroy(); }
       if (clb) {
         clb(err, req, res);
       } else {