nodejs, trycatch and process.on

I have an ExpressJS server as a proxy to delegate HTTP requests from/to various resources of JDK/Cloud/Static servers. When sending several requests at the same time, if the previous request is blocked/fails (e.g. Jetty is down, connection refused), the following requests are pending/fails instead of 200 success. A solution is needed to make each HTTP requests is really independent. My solution is using the following 2 steps:

• npm trycatch module
  Trycatch is An asynchronous domain-based exception handler with long stack traces for node.js. It is pretty cool: even the http request fails (connection reset), it still can guaranteed to return back to front-end without lost theresponse handler res.
• built-in process on event.
  use process.on(‘uncaughtException’) to capture errors, otherwise there will be block in a cascade http requests.

var trycatch = require('trycatch');
var request = require('request');

exports.findAll = function (req, res) {
    trycatch(function () {
        request.get({
            url: rest-api-local-javal-json-call,
            headers: req.headers
        }).pipe(res);
    }, function (err) {
        // if failed from dynamic server, use static data instead:
        console.log('jetty server is ECONNREFUSED! Use mock-data instead.');
        res.sendfile("lib/REST/dummy/all.json");
    })
};

// the process.on('uncaughtException') can't be ignored, otherwise the trycatch not work.
process.on('uncaughtException', function (err) {
    if (err.code && err.code === 'ECONNREFUSED') {
        console.log('--- uncaughtException: rest-api-call-1 ---');
    }
    else {
        console.log('--- uncaughtException: rest-api-call-2 ---');
    }
});

By using this way, there will be **NO BLOCK** in the node/express proxy server even if some requests fail.