Supabase Realtime WebSocket Connection Error

The WebSocket connection to the server failed to establish.

Understanding Supabase Realtime

Supabase Realtime is a powerful tool that provides real-time capabilities to your applications by leveraging PostgreSQL's LISTEN/NOTIFY functionality. It allows developers to subscribe to changes in their database and receive updates instantly, making it ideal for applications that require live data updates, such as chat applications, live dashboards, and collaborative tools.

Identifying the WebSocket Connection Error

One common issue developers encounter when using Supabase Realtime is the 'WebSocket Connection Error'. This error manifests when the WebSocket connection to the server fails to establish, preventing real-time updates from being received by the client.

Symptoms of the Error

When this error occurs, you may notice that your application does not receive any real-time updates. In the browser's developer console, you might see an error message similar to: WebSocket connection to 'ws://your-supabase-url/realtime/v1' failed.

Exploring the Root Cause

The root cause of the WebSocket Connection Error often lies in misconfigurations or network issues. It could be due to incorrect WebSocket URL, server-side restrictions, or network policies blocking WebSocket connections.

Common Causes

Incorrect WebSocket URL or endpoint.
Network policies or firewalls blocking WebSocket traffic.
Server not configured to support WebSocket connections.

Steps to Resolve the WebSocket Connection Error

To resolve this issue, follow these steps:

1. Verify WebSocket URL

Ensure that the WebSocket URL is correctly configured in your application. The URL should be in the format: wss://your-supabase-url/realtime/v1. If you're using a secure connection, make sure to use wss:// instead of ws://.

2. Check Server Configuration

Confirm that your Supabase server is configured to support WebSocket connections. You can refer to the Supabase Realtime documentation for guidance on setting up your server correctly.

3. Inspect Network Policies

Review your network policies and firewall settings to ensure that they allow WebSocket traffic. You may need to whitelist the Supabase server's IP address or domain.

4. Test with a WebSocket Client

Use a WebSocket client tool like WebSocket Echo Test to test the connection manually. This can help identify if the issue is with the client-side configuration or the server.

Conclusion

By following these steps, you should be able to diagnose and resolve the WebSocket Connection Error in Supabase Realtime. Ensuring proper configuration and network settings will help maintain a stable real-time connection for your applications.

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MORE ISSUES

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The schema for an event does not match the expected format.

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The logic for processing events is not valid or incorrectly implemented.

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The event handler specified is not valid or incorrectly implemented.

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Server-Side Latency

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The metadata associated with an event is not valid or incomplete.

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The client application is consuming excessive memory due to a leak.

Supabase Realtime Server Resource Exhaustion

The server has run out of resources to handle incoming requests.

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There is a misconfiguration on the Supabase Realtime server.

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The callback function for an event is not valid or incorrectly implemented.

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The event queue has exceeded its capacity, leading to dropped events.

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The event listener specified is not valid or incorrectly implemented.

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The subscription ID provided is not valid or does not exist.

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An unexpected error occurred on the server side.

Supabase Realtime Data Serialization Error

An error occurred while serializing data for transmission.

Supabase Realtime Client-Side Throttling

The client is being throttled due to excessive requests.

Supabase Realtime Invalid Event Data

The data associated with an event is not valid or incomplete.

Supabase Realtime Database Trigger Error

An error occurred while executing a database trigger associated with a Realtime event.

Supabase Realtime Server Response Timeout

The server took too long to respond to a request.

Supabase Realtime Invalid Subscription Path

The path specified for the subscription is not valid.

Supabase Realtime Event Handling Error

An error occurred while processing an event on the client side.

Supabase Realtime Invalid Channel Topic

The topic specified for the channel is not valid.

Supabase Realtime WebSocket Connection Error

The WebSocket connection to the server failed to establish.

Supabase Realtime Invalid Event Filter

The filter applied to events is not valid or incorrectly formatted.

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There are discrepancies between the data on the client and server.

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The Supabase Realtime server is temporarily unavailable due to maintenance or an outage.

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The client is processing the same event multiple times.

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The parameters provided for the subscription are invalid or incomplete.

Supabase Realtime Channel Not Found

The specified channel does not exist on the server.

Supabase Realtime CORS Policy Error

The request is blocked due to Cross-Origin Resource Sharing (CORS) policy restrictions.

Supabase Realtime Network Error

A general network error is preventing communication with the Supabase Realtime server.

Supabase Realtime Invalid JSON Response

The server response is not a valid JSON object.

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The client has exceeded the allowed number of requests in a given time period.

Supabase Realtime Data Sync Delay

There is a noticeable delay in data synchronization between the client and server.

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The Supabase Realtime server is experiencing high load and cannot process requests efficiently.

Supabase Realtime Invalid API Key error when attempting to connect to Supabase Realtime.

The API key provided is incorrect or not authorized for the requested operation.

Supabase Realtime Channel Already Subscribed

The client is attempting to subscribe to a channel that is already subscribed.

Supabase Realtime Invalid JWT Claims

The JWT token contains invalid claims that do not match the expected values.

Supabase Realtime Unsupported Event Type

The event type specified is not supported by Supabase Realtime.

Supabase Realtime SSL Certificate Error

The SSL certificate used by the server is invalid or expired.

Supabase Realtime Invalid Event Payload

The event payload received does not match the expected format.

Supabase Realtime Subscription Limit Exceeded

The number of active subscriptions has exceeded the allowed limit.

Supabase Realtime 403 Forbidden

The client does not have permission to access the requested resource.

Supabase Realtime Connection Timeout

The client is unable to establish a connection with the Supabase Realtime server within the expected time frame.

Supabase Realtime Disconnected from Server

The connection to the Supabase Realtime server was lost.

Supabase Realtime Invalid Channel Name

The channel name used for subscribing to events is not valid.

Supabase Realtime Authentication Failed

Invalid or expired JWT token used for authentication.

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