Error response not sent to client

[oprince]

Hi

I'm using proxy.web to forward client requests.
When destination server is up, my code works as expected.
When destination server is down, ECONNREFUSED error is catch and printed to console.log. I would like to send that error back to the client, and tried using the sample provided here. Unfortunately, the error response does not arrive to the client (tried both chrome and firefox). Please find below code. Why does the response not sent to the client ?

var proxyServer = http.createServer(function(req, res) {

    if(req.path === 'forbidden') {
        return res.end('nope');
    }

    var url_parts = url.parse(req.url);
    var extname = path.extname(url_parts.pathname);

        if (extname || url_parts.pathname.length <= 1){
            proxy.web(req, res, {
                target: 'http://localhost:'+config.fileServer.port
            });
        }
        else{
            proxy.web(req, res, {
                target: config.recognitionServer.url
            }, function(e) {
                console.log(e.message);
                if (!res.headersSent) {
                    res.writeHead(500, { 'content-type': 'application/json' });
                }
                res.end(JSON.stringify({ error: 'proxy_error', reason: e.message }));
            });
        }

}).listen(config.proxyServer.port, function () {
    console.log('Proxy server is listening on port ' + config.proxyServer.port);
});

[IGZjaviernieto]

+1

[igzdavidsuarez]

+1

[acanimal]

I'm using http-proxy as a middleware and works fine returning any kind of error: connect ECONNREFUSED, getaddrinfo ENOTFOUND, etc.

    // Proxy request to the provider
    proxy.web(req, res, {
      target: provider.target
    }, function(err) {
      // If there is any proxy error return the error.
      next(err);
    });

Your code at the else seems fine maybe your request is entering in the if part.

Cheers.

[oprince]

Hi acanimal,
"If" part is reached, and the error is printed to the console log. I have found a partial solution on client side, it is documented in: http://stackoverflow.com/questions/31260825/node-js-http-proxy-error-response-not-sent-to-client.
It works well once or twice while listening server is up. But socket gets corrupted and server should be restarted to recover.