Fix GCP Pub/Sub Push Errors

When working with GCP Pub/Sub, you may encounter a configuration error that prevents your data pipeline or messaging system from working. This guide explains the most common mistake with push and shows the exact fix.

A Common Mistake

Configuring a push subscription with an unsecured HTTP endpoint instead of HTTPS, causing Pub/Sub to reject the endpoint or transmit messages insecurely.

The incorrect command:

gcloud pubsub subscriptions create my-sub --topic=my-topic --push-endpoint=http://my-service.example.com/push

Error output:

ERROR: (gcloud.pubsub.subscriptions.create) INVALID_ARGUMENT: Push endpoint must use HTTPS (TLS). Pub/Sub only delivers messages to HTTPS endpoints for security. HTTP endpoints are not allowed.

The Correct Approach

The right way to configure push in GCP Pub/Sub:

gcloud pubsub subscriptions create my-sub --topic=my-topic --push-endpoint=https://my-service.example.com/push

Successful result:

Created subscription [my-sub].
Push endpoint: https://my-service.example.com/push.
Pub/Sub delivers messages via HTTPS POST requests. The endpoint must return 200/201/204 within the ack deadline. For authentication, configure push auth service account.

How to Prevent This

Always use HTTPS for push endpoints. Configure push auth with a service account for authentication. The push endpoint must handle POST requests with Pub/Sub message format. Deadline for ack: 10-600 seconds. If the endpoint is unavailable, messages are retried with exponential backoff.

FAQ

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