sse

Cloud Run Server Sent Events HTTP/2 + Fastify

This Fastify application serves Server Sent Events 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

You can use the gcloud SDK:

git clone https://github.com/nearform/fastify-cloud-run.git
cd fastify-cloud-run/sse
gcloud beta run deploy fastify-sse --use-http2 --source=.

You may need to specify additional options to the command based on how your Cloud Shell is configured

Cleanup: Remove the fastify-sse 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:

   npm install
   npm start

Verifying sse over 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 -N --http2-prior-knowledge http://localhost:3000

   Note: If you have deployed on Cloud Run, you can replace localhost:3000 with your Cloud Run service URL.

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

   * Connection state changed (MAX_CONCURRENT_STREAMS == 4294967295)!
   < HTTP/2 200
   < date: Mon, 25 Jan 2021 23:01:07 GMT
   <
   data:2021-01-25T23:01:07.594Z
   data:2021-01-25T23:01:08.595Z
   

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.