I'm trying to deploy my Node.js app on Google App Engine and it deployed fine, but it can't connect to Google Cloud SQL for some reason. Here's what it throws:

```
Error: connect ENOENT /cloudsql/my-project-id:asia-east1:my-sql-instance

```

Here's how I configured the connection:

```
if (process.env.INSTANCE_CONNECTION_NAME) {
     exports.mysqlConfig = {
         user: process.env.GCLOUD_SQL_USERNAME,
         password: process.env.GCLOUD_SQL_PASSWORD,
         socketPath: '/cloudsql/' + process.env.INSTANCE_CONNECTION_NAME
     }
} else {
    // Use settings for localhost
}

```

I'm using `node-mysql` module to connect to the database.

The App Engine and Cloud SQL are already in the same project.
My theory is that the App Engine and the Cloud SQL has to be in the same project *and* same region, but I'm not sure.