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No 'Access-Control-Allow-Origin' header is present on the requested resource. #641
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Sorry can't post client side code properly, github just blank it out.. |
So this isn't important, I passed two days debugging my code to see what I was doing wrong.. |
I'm experiencing the same issue:
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I tried to set the header, but it didin't help
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I see in your server code , io.set() , are you using current socket,io stable 0.9.16? I found out if you emit right after connect in client you get this error... |
And your client code is emitting right after connect.. there is the issue. |
I'm on node 0.10.24 and latest socket.io.js from https://github.com/LearnBoost/socket.io-client Nope, I commented out all emits, same issue: |
Issue for me, as well. I want to emit immediately after connection, which is before the transport is upgraded from XHR Polling. Instructing the client to use the "websocket" transport first might help mitigate the issue, but it still won't help users in browsers that don't support websockets.
engine.io-client XHR transport really needs CORS support. |
I'm also having this isue. |
I'm also having this issue. |
good ^^* |
https://github.com/theoctal/livenote/blob/master/app.js#L11 look here. The issue is essentially solved by setting middleware for express. This makes good example for those who want to know about how to set middleware. |
I guess the socket.io connection request doesn't go through the middlewares set on express. In my case Access-Control-Allow-Origin is set by default as where the request is from. It just works. I'm using 1.0.0-pre2 |
Experiencing the same problem |
Look at my code, works perfectly. |
I solved my issue by removing the the transports options.... var express = require('express'); io.adapter(redis({ host: 'localhost', port: })); server.listen(, '', function(){ ........ |
The problem I faced was, serving the client socket.io.js from a different location. You can avoid this issue by serving the client js file from the same server where you are trying to connect to. for example, my initial client code was this and it was throwing error
once I modified it to this, it worked alright.
And my server code is,
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👍 I run into this issue when include client |
I'm also running into this issue on 1.0.4 when serving it from the socket.io CDN |
Me too. Tried:
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Guys, I had the same problem. I got the same error Chrome and Firefox displayed in console. I have my socket.io and client loading from a sub-domain i.e. chat.mydomain.com. If you are using Node.js, I solved my issue using the following setup. SERVER SIDE (chat.mydomain.com)Express version 4 var express = require('express'); server.listen([PORT NUMBER], [IP], function(){ CLIENT SIDE (mydomain.com)script src="http://[IP]:[PORT NUMBER]/socket.io/socket.io.js" type="text/javascript"></script> var socket = io.connect("[IP]:[PORT NUMBER]") Note 1: Note the [IP] & [PORT NUMBER] are the same in this case. |
Hi guys. The 1.x version works good for me. How are you connecting the server at the client side? Make sure the correct server address and port are used. The browser might complain CORS issues if the wrong address is requested as no access-control-allow-origin header is set in the response. |
IE you visit But your socket server is running on |
I'm having the same issue with socket.io-client@1.0.4. I've tried different versions and it works good up to 0.9.17 but problems start with 1.0.0 I don't have any problem if I use the client file from the server. |
We are also having this problem. |
+1 socket.io-client@1.0.4. |
I have to retract myself. Upgrading to socket.io@1.0.4 in the server side solves the CORS problem with the client library. |
i fixed the message of headers in NodeJS/Express with this:
but still getting a:
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fixed the 404 (Not Found) with this: https://stackoverflow.com/a/27394696/2038286 because my config is for Express v4 Solved. |
the same issue here
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what code is instead of @crossorigin in python? |
the same issue here |
I have the same problem. V 2.1.1 server and client |
Same problem here with version 2.2.0. |
Have the same problem. |
I also updated to the latest version and added the tag transports. I did as shown here |
this solution works in 2020, socket io ver 3.0.0, express 4.16.1, react 16.8.6. Thank you so much |
For future readers: Using Response for Socket.IO v2: the library should automatically add the necessary headers You can use the const io = require("socket.io")(httpServer, {
origins: ["https://example.com"]
}); For custom headers/sending cookies (withCredentials), you can use the const io = require("socket.io")(httpServer, {
origins: ["https://example.com"],
// optional, useful for custom headers
handlePreflightRequest: (req, res) => {
res.writeHead(200, {
"Access-Control-Allow-Origin": "https://example.com",
"Access-Control-Allow-Methods": "GET,POST",
"Access-Control-Allow-Headers": "my-custom-header",
"Access-Control-Allow-Credentials": true
});
res.end();
}
}); For Socket.IO v3: you must now explicitly enable CORS: const io = require("socket.io")(httpServer, {
cors: {
origin: "https://example.com",
methods: ["GET", "POST"],
allowedHeaders: ["my-custom-header"],
credentials: true
}
}); If you still get a
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Thank you so much @darrachequesne for summing it up. Works perfectly! |
thanks @darrachequesne. I feel this would be a nice addition to the docs, maybe like a note. |
@prettyirrelevant you are absolutely right 👍 Doc for v2: https://socket.io/docs/v2/handling-cors/ |
i also had the same issue so i just added this in package.json => {"proxy":"backend url"} and in where am using socketio i called |
this is exactly what was the problem i my case. spent few hours trying to figure out. thanks |
The version I used was 3.0.4, and this error also occurred. Many methods were used. The modification according to the official cors had no effect. Finally, the transports were added to the client to run successfully.
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This worked for me! I'm using version 3.0.4 of socket as well |
Could you please explain? Please see the example here: https://github.com/socketio/socket.io-fiddle/tree/cors Note: disabling HTTP polling (with |
.....would 'http://localhost' be valid for the deployed site on Heroku ?? |
Volvi a la version 2.3.0 y funciono a la primera. |
I'm locking the thread, as I feel there's nothing more we can do to help. Please check the documentation here:
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XMLHttpRequest cannot load http://domain.com:8080/socket.io/?EIO=2&transport=polling&sid=z1N_9JpKElJJ6b2qAAAL. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://domain.com' is therefore not allowed access.
server:
var server = require('http').Server();
var io = require('socket.io')(server);
io.on('connection', function(socket){
socket.on('test', function(data){});
socket.on('event', function(data){});
socket.on('disconnect', function(){});
});
server.listen(8080);
client:
<script>src="http://domain.com:8080/socket.io/socket.io.js"</script>
var socket = io.connect('http://domain.com:8080');
socket.on('connect', function(){
socket.emit( 'test' , { test : 'right' });// if use right on connect , errors out
socket.on('event', function(data){});
socket.on('disconnect', function(){});
});
Can anyone replicate this issue? browser giving error is Chrome, in Firefox just loops..
I think is because when connect and you try to send an emit right away , the client is upgrading connection and fired the emit every time..
It just an assumption , one with better acknowledge could give some more info..
Same test was done with previous repository ver 1.. and it doesn't have same behavior.
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