Header frame is not valid

Question

Header frame is not valid

I have been working on developing a real-time application using NodeJS as my server and Socket.IO to enable live updates.

However, I encountered an error message that reads:

 WebSocket connection to 'wss://localhost:1234/socket.io/?EIO=3&transport=websocket' failed: Invalid frame header

I've attempted various solutions such as switching from https to http and downgrading the Socket.IO version, yet none of these changes have resolved the issue. I am seeking assistance in identifying the root cause of this problem so that I can troubleshoot it within my application. I am determined to resolve this without resorting to alternative COMET protocols.

javascript websocket socket.io

Answer 1

Answer №1

Ensure that the socket.io and socket.io-client versions match on both the server and client sides.

Answer 2

Ensure that the socket.io and socket.io-client versions match on both the server and client sides.

Answer 3

Answer №2

It turned out that the problem was caused by my error of initializing the server with socket.io twice.

Answer 4

It turned out that the problem was caused by my error of initializing the server with socket.io twice.

Answer 5

Answer №3

In my case, the issue arose from connecting with a client using version 2 while the server was running version 4. Following the instructions outlined in the documentation, I needed to activate the allowEIO3 setting on the server.

Answer 6

In my case, the issue arose from connecting with a client using version 2 while the server was running version 4. Following the instructions outlined in the documentation, I needed to activate the allowEIO3 setting on the server.

Answer 7

Answer №4

Encountered a problem while utilizing create-react-app and launching it with "npm run start" to access the live refresh local version during development. The default websocket path used was /ws, which clashed with my app that also utilized this path. Consequently, when employing setupProxy.js with http-proxy-middleware, both paths were forwarded to the api server, resulting in invalid frame headers.

To resolve this issue, I modified the websocket route within the web app to something distinct like /websocket instead. Additionally, I adjusted the setupProxy.js file as follows:

const { createProxyMiddleware } = require('http-proxy-middleware');
module.exports = function(app) {
    app.use(
        // Avoid using `/ws` as it conflicts with create-react-app's hotrefresh socket.
        createProxyMiddleware('/websocket', {
            target: 'http://localhost:3000',
            ws: true,
            changeOrigin: true,
        })
    );
};

Answer 8

Encountered a problem while utilizing create-react-app and launching it with "npm run start" to access the live refresh local version during development. The default websocket path used was /ws, which clashed with my app that also utilized this path. Consequently, when employing setupProxy.js with http-proxy-middleware, both paths were forwarded to the api server, resulting in invalid frame headers.

To resolve this issue, I modified the websocket route within the web app to something distinct like /websocket instead. Additionally, I adjusted the setupProxy.js file as follows:

const { createProxyMiddleware } = require('http-proxy-middleware');
module.exports = function(app) {
    app.use(
        // Avoid using `/ws` as it conflicts with create-react-app's hotrefresh socket.
        createProxyMiddleware('/websocket', {
            target: 'http://localhost:3000',
            ws: true,
            changeOrigin: true,
        })
    );
};

Answer 9

Answer №5

Switched to using the standalone server for socket.io and it solved the issue that I was facing. Originally, I had added it to the express server. This snippet of code resolved the problem..

const io = require("socket.io")();

//listening on a different port
io.listen(4000);

Answer 10

Switched to using the standalone server for socket.io and it solved the issue that I was facing. Originally, I had added it to the express server. This snippet of code resolved the problem..

const io = require("socket.io")();

//listening on a different port
io.listen(4000);

Answer 11

Answer №6

I encountered a similar problem while using socket.io-client. Fortunately, I was able to resolve the issue by following the steps below.

If you are experiencing this issue, you can attempt to specify the transports option as only websocket in the client:

io.connect(url, { transports: ['websocket'] }); // the default is ['polling', 'websocket']

You can refer to this link for more information: https://github.com/socketio/socket.io-client/issues/1097#issuecomment-301301030

Answer 12

I encountered a similar problem while using socket.io-client. Fortunately, I was able to resolve the issue by following the steps below.

If you are experiencing this issue, you can attempt to specify the transports option as only websocket in the client:

io.connect(url, { transports: ['websocket'] }); // the default is ['polling', 'websocket']

You can refer to this link for more information: https://github.com/socketio/socket.io-client/issues/1097#issuecomment-301301030

Header frame is not valid

Answer №1

Answer №2

Answer №3

Answer №4

Answer №5

Answer №6

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