For Cloud Run services, Cloud Run by default downgrades HTTP/2 requests to HTTP/1 when those requests are sent to the container. If you want to explicitly set your service to use HTTP/2 end-to-end, with no such downgrading, you can configure it for HTTP/2. This page shows how to do the configuration.
For more information on invoking services using HTTP, refer to Invoking with an HTTPS Request.
Before you configure
Your Cloud Run service must handle requests in
h2c) format, because TLS is still terminated automatically by Cloud Run.
To confirm that your service supports
test the service locally using this cURL command:
curl -i --http2-prior-knowledge http://localhost:PORT
Setting and updating HTTP/2 end-to-end
Any configuration change leads to the creation of a new revision. Subsequent revisions will also automatically get this configuration setting unless you make explicit updates to change it.
Click Create Service if you are configuring a new service you are deploying to. If you are configuring an existing service, click on the service, then click Edit and Deploy New Revision.
If you are configuring a new service, fill out the initial service settings page as desired, then click Next > Container, Variables & Secrets, Connections, Security to reach the service configuration page.
Click the Connections tab.
Select the checkbox Enable http/2 connections
Click Create or Deploy.
You can update a given service to use HTTP/2 by using the following command:
gcloud run services update SERVICE --use-http2
SERVICE with the name of your service.
You can also set your service to use HTTP/2 during deployment using the command:
gcloud run deploy --image IMAGE_URL --use-http2
Replace IMAGE_URL with a reference to the container image, for
You can download and view existing service configuration using the
gcloud run services describe --format export command, which yields
cleaned results in YAML format. You can then modify the fields described below and
upload the modified YAML using the
gcloud run services replace command.
Make sure you only modify fields as documented.
To view and download the configuration:
gcloud run services describe SERVICE --format export > service.yaml
portswith the name
containerPortwith the port of your choice, as shown belows:
apiVersion: serving.knative.dev/v1 kind: Service metadata: name: SERVICE spec: template: metadata: name: REVISION spec: containers: - image: IMAGE_URL ports: - name: h2c containerPort: 8080
- SERVICE with the name of your Cloud Run service
- IMAGE_URL with a reference to the container image, for
- REVISION with a new revision name or delete it (if present). If you supply a new revision name, it must meet the following criteria:
- Starts with
- Contains only lowercase letters, numbers and
- Does not end with a
- Does not exceed 63 characters
- Starts with
Replace the service with its new configuration using the following command:
gcloud run services replace service.yaml
View http/2 settings
To view the current http/2 settings for your Cloud Run service:
Click the service you are interested in to open the Service details page.
Click the Revisions tab.
In the details panel at the right, the http/2 setting is listed under the Connections tab.
Use the following command:
gcloud run services describe SERVICE
Locate the http/2 setting in the returned configuration.