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
HTTP/2 cleartext
(h2c
) format, because TLS is still terminated automatically by Cloud Run.
To confirm that your service supports h2c
requests,
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.
You can specify the use of HTTP/2 end-to-end using the Google Cloud console, the gcloud command line, or a YAML file when you create a new service or deploy a new revision:
Console
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 Container, connections, security to expand the service configuration page.
Click the Connections tab.
Select the checkbox Enable http/2 connections
Click Create or Deploy.
Command line
You can update a given service to use HTTP/2 by using the following command:
gcloud run services update SERVICE --use-http2
Replace 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
example, us-docker.pkg.dev/cloudrun/container/hello:latest
YAML
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
Update
ports
with the nameh2c
andcontainerPort
with 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
Replace
- SERVICE with the name of your Cloud Run service
- IMAGE_URL with a reference to the container image, for
example,
us-docker.pkg.dev/cloudrun/container/hello:latest
- 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
SERVICE-
- 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
Terraform
Add the following to a google_cloud_run_service
resource in your Terraform
configuration, under template.spec.containers
. If your container listens
for HTTP requests on a port other than 8080
, replace 8080
with that port
number.
To apply your Terraform configuration in a Google Cloud project, complete the following steps:
- Launch Cloud Shell.
- Set the Google Cloud project where you want to apply the Terraform configuration:
export GOOGLE_CLOUD_PROJECT=PROJECT_ID
- Create a directory and a new file within that directory. The filename must have the
.tf
extension—for examplemain.tf
. In this tutorial, the file is referred to asmain.tf
.mkdir DIRECTORY && cd DIRECTORY && touch main.tf
Copy the sample code into the newly created
main.tf
.Optionally, copy the code from GitHub. This is recommended when the Terraform snippet is part of an end-to-end solution.
- Review and modify the sample parameters to apply to your environment.
- Save your changes.
- Initialize Terraform:
terraform init
- Review the configuration and verify that the resources that Terraform is going to create or
update match your expectations:
terraform plan
Make corrections to the configuration as necessary.
- Apply the Terraform configuration by running the following command and entering
yes
at the prompt:terraform apply
Wait until Terraform displays the "Apply complete!" message.
- Open your Google Cloud project to view the results. In the Google Cloud console, navigate to your resources in the UI to make sure that Terraform has created or updated them.
View http/2 settings
To view the current http/2 settings for your Cloud Run service:
Console
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.
Command line
Use the following command:
gcloud run services describe SERVICE
Locate the http/2 setting in the returned configuration.