When I create a project by using create-react-app or vue init, and execute the command npm run dev/start, it always happened with an error about Websocket on my console tab. I don't understand what the problem is.
And the network tab always pending a request about socket constantly.
WebSocket connection to 'ws://localhost:3000/sockjs-node/863/gwfp1dnj/websocket' failed: Connection closed before receiving a handshake response
// these devServer options should be customized in /config/index.js
devServer:{
...
host: HOST || config.dev.host,
port: PORT || config.dev.port,
...
}
Ensure your dev host and port is configured correctly that like above.
I am new to WebRTC and WebSockets and was following this tutorial to create a WebRTC demo project, but I am unable to create a WebSocket connection. I have followed the same steps as mentioned in the project.
His project is running on port 8080 and he mentioned ws://localhost:9090. My project is running on port 8081, but I copied his URL ws://localhost:9090 because I didn't know the significance of 9090 and I received this error and my server is node.js. i changed local host to 8081 as well but then i am getting hand shake error.
WebSocket connection to 'ws://localhost:9090/' failed: Error in
connection establishment: net::ERR_CONNECTION_REFUSED.
Chrome doesn't allow unsecure websocket (ws) connections to localhost (only wss, so you should setup a TLS certificate for your local web/websocket server).
However the same should work fine with Firefox.
You need to use ws://yourIp:9090/, where yourIP is like 192.168.?.?.
Usually WebRTC requires a secure connection (that is https).
The error you have got is due to TLS/SSL certificates occupied, may be they are not properly configured in your project.
Provide a valid TLS/SSL certificate and also configure it correctly in project, then it will work without the above error.
try to change the port to 8080
const ws = new WebSocket('ws://localhost:8080/chat')
I guess this is a generic websocket issue.
Change the url to a dynamic name using the built-in location.host variable and change the protocol to secure websocket wss if you have set-up the TLS:
const ws = new WebSocket("wss://" + location.host + "/")
Port 9090 is used by reactotron. Probably you are using it in your project and your app cannot connect with reactotron because it is closed. Just open reactotron and the error will disappear.
also you could easily change the mappings of IP addresses to host names,
on windows go to C:\Windows\System32\drivers\etc\hosts and uncomment this line
127.0.0.1 localhost
save and restart.
WebSocket connection to 'ws://localhost:8080/' failed
Must ensure server file is running
I git this above problem
maybe you forgot to start websocket server, check it again, with configuration in my project, run:
php artisan websocket:init
My server threw this today, which is a Node.js error I've never seen before:
Error: getaddrinfo EAI_AGAIN my-store.myshopify.com:443
at Object.exports._errnoException (util.js:870:11)
at errnoException (dns.js:32:15)
at GetAddrInfoReqWrap.onlookup [as oncomplete] (dns.js:78:26)
I'm wondering if this is related to the DynDns DDOS attack which affected Shopify and many other services today. Here's an article about that.
My main question is what does dns.js do? What part of node is it a part of? How can I recreate this error with a different domain?
If you get this error with Firebase Cloud Functions, this is due to the limitations of the free tier (outbound networking only allowed to Google services).
Upgrade to the Flame or Blaze plans for it to work.
EAI_AGAIN is a DNS lookup timed out error, means it is a network connectivity error or proxy related error.
My main question is what does dns.js do?
The dns.js is there for node to get ip address of the domain(in brief).
Some more info:
http://www.codingdefined.com/2015/06/nodejs-error-errno-eaiagain.html
If you get this error from within a docker container, e.g. when running npm install inside of an alpine container, the cause could be that the network changed since the container was started.
To solve this, just stop and restart the container
docker-compose down
docker-compose up
Source: https://github.com/moby/moby/issues/32106#issuecomment-578725551
As xerq's excellent answer explains, this is a DNS timeout issue.
I wanted to contribute another possible answer for those of you using Windows Subsystem for Linux - there are some cases where something seems to be askew in the client OS after Windows resumes from sleep. Restarting the host OS will fix these issues (it's also likely restarting the WSL service will do the same).
For those who perform thousand or millions of requests per day, and need a solution to this issue:
It's quite normal to get getaddrinfo EAI_AGAIN errors when performing a lot of requests on your server. Node.js itself doesn't perform any DNS caching, it delegates everything DNS related to the OS.
You need to have in mind that every http/https request performs a DNS lookup, this can become quite expensive, to avoid this bottleneck and getaddrinfo errors, you can implement a DNS cache.
http.request (and https) accepts a lookup property which defaults to dns.lookup()
http.get('http://example.com', { lookup: yourLookupImplementation }, response => {
// do something here with response
});
I strongly recommend to use an already tested module, instead of writing a DNS cache yourself, since you'll have to handle TTL correctly, among other things to avoid hard to track bugs.
I personally use cacheable-lookup which is the one that got uses (see dnsCache option).
You can use it on specific requests
const http = require('http');
const CacheableLookup = require('cacheable-lookup');
const cacheable = new CacheableLookup();
http.get('http://example.com', {lookup: cacheable.lookup}, response => {
// Handle the response here
});
or globally
const http = require('http');
const https = require('https');
const CacheableLookup = require('cacheable-lookup');
const cacheable = new CacheableLookup();
cacheable.install(http.globalAgent);
cacheable.install(https.globalAgent);
NOTE: have in mind that if a request is not performed through Node.js http/https module, using .install on the global agent won't have any effect on said request, for example requests made using undici
The OP's error specifies a host (my-store.myshopify.com).
The error I encountered is the same in all respects except that no domain is specified.
My solution may help others who are drawn here by the title "Error: getaddrinfo EAI_AGAIN"
I encountered the error when trying to serve a NodeJs & VueJs app from a different VM from where the code was developed originally.
The file vue.config.js read :
module.exports = {
devServer: {
host: 'tstvm01',
port: 3030,
},
};
When served on the original machine the start up output is :
App running at:
- Local: http://tstvm01:3030/
- Network: http://tstvm01:3030/
Using the same settings on a VM tstvm07 got me a very similar error to the one the OP describes:
INFO Starting development server...
10% building modules 1/1 modules 0 activeevents.js:183
throw er; // Unhandled 'error' event
^
Error: getaddrinfo EAI_AGAIN
at Object._errnoException (util.js:1022:11)
at errnoException (dns.js:55:15)
at GetAddrInfoReqWrap.onlookup [as oncomplete] (dns.js:92:26)
If it ain't already obvious, changing vue.config.js to read ...
module.exports = {
devServer: {
host: 'tstvm07',
port: 3030,
},
};
... solved the problem.
I started getting this error (different stack trace though) after making a trivial update to my GraphQL API application that is operated inside a docker container. For whatever reason, the container was having difficulty resolving a back-end service being used by the API.
After poking around to see if some change had been made in the docker base image I was building from (node:13-alpine, incidentally), I decided to try the oldest computer science trick of rebooting... I stopped and started the docker container and all went back to normal.
Clearly, this isn't a meaningful solution to the underlying problem - I am merely posting this since it did clear up the issue for me without going too deep down rabbit holes.
I was having this issue on docker-compose. Turns out I forgot to add my custom isolated named network to my service which couldn't be found.
TLDR; Make sure, in your compose file, you have your custom-networks defined on both services that need to talk to each other.
My error looked like this: Error: getaddrinfo EAI_AGAIN minio-service. The error was coming from my server's backend when making a call to the minio-service using the minio-service hostname. This tells me that minio-service's running service, was not reachable by my server's running service. The way I was able to fix this issue is I changed the minio-service in my docker-compose from this:
docker-compose.yml
version: "3.8"
# ...
services:
server:
# ...
networks:
my-network:
# ...
minio-service:
# ... (missing networks: section)
# ...
networks:
my-network:
To include my custom isolated named network, like this:
docker-compose.yml
version: "3.8"
# ...
services:
server:
# ...
networks:
my-network:
# ...
minio-service:
# ...
networks:
my-network:
# ...
# ...
networks:
my-network:
More details on docker-compose networking can be found here.
This is the issue related to hosts file setup.
Add the following line to your hosts file
In Ubuntu: /etc/hosts
127.0.0.1 localhost
In windows: c:\windows\System32\drivers\etc\hosts
127.0.0.1 localhost
In my case the problem was the docker networks ip allocation range, see this post for details
#xerq pointed correctly, here's some more reference
http://www.codingdefined.com/2015/06/nodejs-error-errno-eaiagain.html
i got the same error, i solved it by updating "hosts" file present under this location in windows os
C:\Windows\System32\drivers\etc
Hope it helps!!
In my case, connected to VPN, the error happens when running Ubuntu from inside Windows Terminal but doesn't happen when opening Ubuntu directly from Windows (not from inside the Windows Terminal)
I had a same problem with AWS and Serverless. I tried with eu-central-1 region and it didn't work so I had to change it to us-east-2 for the example.
I was getting this error after I recently added a new network to my docker-compose file.
I initially had these services:
services:
frontend:
depends_on:
- backend
ports:
- 3005:3000
backend:
ports:
- 8005:8000
I decided to add a new network which hosts other services I wanted my frontend service to have access to, so I did this:
networks:
moar:
name: moar-network
attachable: true
services:
frontend:
networks:
- moar
depends_on:
- backend
ports:
- 3005:3000
backend:
ports:
- 8005:8000
Unfortunately, the above made it so that my frontend service was no longer visible on the default network, and only visible in the moar network. This meant that the frontend service could no longer proxy requests to backend, therefore I was getting errors like:
Error occured while trying to proxy to: localhost:3005/graphql/
The solution is to add the default network to the frontend service's network list, like so:
networks:
moar:
name: moar-network
attachable: true
services:
frontend:
networks:
- moar
- default # here
depends_on:
- backend
ports:
- 3005:3000
backend:
ports:
- 8005:8000
Now we're peachy!
One last thing, if you want to see which services are running within a given network, you can use the docker network inspect <network_name> command to do so. This is what helped me discover that the frontend service was not part of the default network anymore.
Enabled Blaze and it still doesn't work?
Most probably you need to set .env from the right path, require('dotenv').config({ path: __dirname + './../.env' }); won't work (or any other path). Simply put the .env file in the functions directory, from which you deploy to Firebase.
The Example of Dojo tests run under Intern (https://github.com/theintern/intern-examples/tree/master/dojo-example) does not actually test anything, fails on connect to the Sauce network:
$ npm test
> dojo-intern-example#0.1.0 test /home/bogdanbiv/WebstormProjects/intern-examples/dojo-example
> intern-runner config=tests/intern
Listening on 0.0.0.0:9001
Starting tunnel...
Using no proxy for connecting to Sauce Labs REST API.
**********************************************************
A newer version of Sauce Connect (build 1283) is available!
Download it here:
https://saucelabs.com/downloads/sc-4.3-linux.tar.gz
**********************************************************
Started scproxy on port 49172.
Starting secure remote tunnel VM...
Secure remote tunnel VM provisioned.
Tunnel ID: 2f904e21cf1e4c3e83f63a4b3089127c
Secure remote tunnel VM is now: booting
Secure remote tunnel VM is now: running
Remote tunnel host is: maki76020.miso.saucelabs.com
Using no proxy for connecting to tunnel VM.
Establishing secure TLS connection to tunnel...
Cleaning up.
Finished! Deleting tunnel.
Error: failed to connect to tunnel VM.
Error: failed to connect to tunnel VM.
at reject <node_modules/intern/node_modules/digdug/SauceLabsTunnel.js:353:17>
at readStartupMessage <node_modules/intern/node_modules/digdug/SauceLabsTunnel.js:381:12>
at <node_modules/intern/node_modules/digdug/SauceLabsTunnel.js:434:12>
at Array.some <native>
at Socket.<anonymous> <node_modules/intern/node_modules/digdug/SauceLabsTunnel.js:428:21>
at Socket.EventEmitter.emit <events.js:117:20>
at Socket.<anonymous> <_stream_readable.js:746:14>
at Socket.EventEmitter.emit <events.js:92:17>
at emitReadable_ <_stream_readable.js:408:10>
at emitReadable <_stream_readable.js:404:5>
npm ERR! weird error 1
npm WARN This failure might be due to the use of legacy binary "node"
npm WARN For further explanations, please read
/usr/share/doc/nodejs/README.Debian
npm ERR! not ok code 0
Ok it does complain about having an old Sauce Connect binary, but even after downloading and inserting the path of the newest SC (4.3). I also updated .bin/intern-runner to contain js as a running environment as opposed to the old node command. User and password are the ones from the repository (left them unchanged). I followed the documentation and did uncomment the tunnel in the intern config file.
UPDATE: This problem still occurs. I find it wierd that a proxy is started Started scproxy on port 54687., but, further down, Using no proxy for connecting to tunnel VM.. Aren't these lines supposed to match?
It could be that this mismatch has nothing to do with the original problem? The new Sauce Connect binary is still ignored.
UPDATE: Actually this solution affects only client, local - intern-client config=tests/intern. As a result this solution solves a different problem than the one originally posted. /UPDATE
The problem was that although I executed bower install as documented, the bower components installed in a folder set by the bowerrc global configuration. This was quite different from what the Dojo TodoMVC example required for its components.
Also submitted an issue at https://github.com/theintern/intern-examples/issues/10 and a pull request.
I have socket.io running successfully on my node.js installation.
info - socket.io started
The console shows it running ok, but as soon as the client (browser) connects:
socket = io.connect('<my host>:8000');
The console is kicking out an error:
crypto.js:123
return new Hash(hash);
^
TypeError: undefined is not a function
at Object.createHash (crypto.js:123:10)
at WebSocket.onSocketConnect (/node_modules/socket.io/lib/transports/websocket/hybi-16.js:120:23)
at WebSocket.handleRequest (/node_modules/socket.io/lib/transport.js:71:10)
at WebSocket.Transport (/node_modules/socket.io/lib/transport.js:31:8)
at new WebSocket (/node_modules/socket.io/lib/transports/websocket/hybi-16.js:59:13)
at new WebSocket (/node_modules/socket.io/lib/transports/websocket.js:31:17)
at Manager.handleClient (/node_modules/socket.io/lib/manager.js:661:19)
at Manager.handleUpgrade (/node_modules/socket.io/lib/manager.js:618:8)
at Server.<anonymous> (/node_modules/socket.io/lib/manager.js:123:10)
at Server.emit (events.js:88:20)
can anyone understand what this might mean?
My code has been working fine on my local machine, its only when moving it to my production server does this error happen.
It turns out it's because Node was installed with the option --without-ssl. This means it doesnt install any of the crypto stuff, which was needed by socket.it. I installed openssl, reinstalled Node, and this fixed it :)