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How to fix the error during websocket handshake: unexpected response code: 400?

Alton Alexander
By Alton AlexanderUpdated on June 4th, 2022

Error during websocket handshake: unexpected response code: 400 is an error that can occur when trying to establish a websocket connection. This error can occur for a number of reasons, but one common cause is if the server is not configured to support websockets. Another possible cause is if there is a firewall or other network security measure in place that is blocking websocket traffic.

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1. Check that the URL for the websocket is correct

In order to check that the URL for the websocket is correct, you will need to access the websocket URL in a web browser. First, you will need to find the URL for the websocket. Next, you will need to open the URL in a web browser. Next, you will need to check the status of the websocket. If the status is "connecting", the URL for the websocket may be incorrect. If the status is "connecting", you will need to check the the port number for the websocket. If the port number is incorrect, you will need to correct the URL for the websocket.

2. Check that the websocket port is open and accessible

  1. In your browser, open the web console.
  2. In the web console, click the Network tab.
  3. In the Network tab, click the Websocket port.
  4. If the websocket port is open and accessible, the status should say "Open." If the status says "Closed," then the websocket port is not open and you will need to open it.

3. Check that the websocket server is running and accessible

  1. Open a web browser and navigate to the URL of the websocket server.
  2. If the websocket server is running and accessible, you should see a message confirming that the server is open and accepting connections.
  3. If the websocket server is not running or is not accessible, you will receive an error message indicating that the handshake failed.

4. Try using a different browser or a different version of the browser

-Open a different browser and connect to the same websocket server. -In the new browser, enter the following into the address bar: ws://localhost:8080/ -Click the "Connect" button. -In the "WebSocket" tab, click the "Handshake" button. -On the "Handshake" window, click the "Send" button. -In the "Message" window, enter the following into the "Message" box: {"error":"400","message":"Unable to send message to server"} -Click the "Send" button. -In the "Handshake" window, click the "Receive" button. -In the "Message" window, enter the following into the "Message" box: {"error":"100","message":"Server responded with error code: 100"} -Click the "Receive" button. -In the "Handshake" window, click the "Close" button. -In the "WebSocket" tab, click the "Close" button.

Still not working? maybe try one of these options:

  1. Check firewall settings and make sure that the websocket port is not being blocked