h2c

README

Cloud Run HTTP/2 Sample Server

This Go application serves requests using only the HTTP/2 cleartext (h2c) protocol (it does not support upgrading from HTTP/1.1).

It is provided for testing end-to-end HTTP/2 capabilities on Cloud Run.

Deploying to Cloud Run

Click this button:

Alternatively, you can use the gcloud SDK:

git clone https://github.com/GoogleCloudPlatform/golang-samples.git
cd ./golang-samples/run/h2c
gcloud beta run deploy http2-test --use-http2 --source=.

Cleanup: Remove the http2-test Service you deployed from Cloud Run using the Cloud Console.

Testing locally

1. Check out this repository and navigate to this directory

2. Start the server locally:

   go run .
   

Verifying h2c

1. After the server starts, make a request using curl and use --http2-prior-knowledge to prevent upgrading from HTTP/1.1 (which is intentionally not supported by this program).

   curl -v --http2-prior-knowledge localhost:8080
   

   Note: If you have deployed on Cloud Run, you can replace localhost:8080 with your Cloud Run service URL.

2. The curl output should indicate HTTP/2 is used:

   < HTTP/2 200
   < content-type: text/plain; charset=utf-8
   < content-length: 32
   < date: Fri, 08 Jan 2021 18:13:06 GMT
   
   This request is served over HTTP/2.0 protocol!
   

Since this server intentionally doesn't support upgrading from HTTP/1.1, performing the same query without the --http2-prior-knowledge option makes curl to use HTTP/1, which fails as expected.