Google Pub/Sub PUSH_ENDPOINT_UNAUTHORIZED error when trying to send messages to a push endpoint.

The push endpoint does not authorize the Pub/Sub service to send messages.

Understanding Google Pub/Sub

Google Cloud Pub/Sub is a messaging service that allows applications to exchange messages reliably, quickly, and asynchronously. It is designed to provide real-time messaging between applications, enabling developers to build robust and scalable systems. Pub/Sub decouples senders and receivers, allowing for flexible and scalable message distribution.

Identifying the Symptom

When using Google Pub/Sub, you might encounter the PUSH_ENDPOINT_UNAUTHORIZED error. This error indicates that the push endpoint you have configured does not authorize the Pub/Sub service to send messages. As a result, messages are not delivered to the endpoint, and the system may experience delays or failures in message processing.

Exploring the Issue

What is PUSH_ENDPOINT_UNAUTHORIZED?

The PUSH_ENDPOINT_UNAUTHORIZED error occurs when the push endpoint, which is supposed to receive messages from Pub/Sub, is not properly configured to accept requests from the Pub/Sub service. This can happen due to incorrect authentication or authorization settings on the endpoint.

Common Causes

The endpoint does not recognize the Pub/Sub service account.
Incorrect permissions or roles assigned to the Pub/Sub service account.
Misconfigured endpoint URL or authentication settings.

Steps to Fix the Issue

1. Verify Endpoint Configuration

Ensure that the push endpoint is correctly configured to accept requests from the Pub/Sub service. Check the endpoint URL and make sure it is reachable and correctly specified in your Pub/Sub subscription settings.

2. Set Up Proper Authentication

Configure the endpoint to authenticate requests from the Pub/Sub service. You can use Google Cloud IAM to manage authentication and authorization. Ensure that the Pub/Sub service account has the necessary permissions to send messages to the endpoint.

gcloud projects add-iam-policy-binding YOUR_PROJECT_ID \ --member=serviceAccount:service-PUBSUB_SERVICE_ACCOUNT@gcp-sa-pubsub.iam.gserviceaccount.com \ --role=roles/pubsub.publisher

3. Test the Endpoint

After configuring authentication, test the endpoint to ensure it accepts messages from Pub/Sub. You can use tools like cURL to simulate requests and verify that the endpoint responds correctly.

curl -X POST -H "Content-Type: application/json" \ -d '{"message": "test"}' \ https://your-endpoint-url.com/receive

4. Monitor and Log

Enable logging on your endpoint to capture incoming requests and any errors. This will help you diagnose issues and ensure that the endpoint is functioning as expected. Use Google Cloud Logging to monitor and analyze logs.

Conclusion

By following these steps, you can resolve the PUSH_ENDPOINT_UNAUTHORIZED error and ensure that your Google Pub/Sub push endpoint is properly configured to receive messages. Proper authentication and endpoint configuration are crucial for maintaining a reliable messaging system.

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