Feature availability
This page applies to Grid and Dedicated Gen 3 projects. To ensure you have enough resources to support multiple apps, you need at least a Medium plan. To set up multiple apps on Dedicated Gen 2 environments, contact Sales.
Define relationships between your multiple apps
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When you set up a project containing multiple applications,
by default your apps can’t communicate with each other.
To enable connections, define relationships between apps using the http endpoint.
You can’t define circular relationships.
If app1 has a relationship to app2, then app2 can’t have a relationship to app1.
If you need data to go both ways, consider coordinating through a shared data store,
like a database or RabbitMQ server.
Relationships between apps use HTTP, not HTTPS. This is still secure because they’re internal and not exposed to the outside world.
Relationships example 
You have two apps, app1 and app2, and app1 needs data from app2.
In your app configuration for app1, define a relationship to app2:
app1:
relationships:
api: "app2:http"Once they’re both built, app1 can access app2 at the following URL: http://api.internal.
The specific URL is always available through the PLATFORM_RELATIONSHIPS variable:
$ echo $PLATFORM_RELATIONSHIPS | base64 --decode | jq '.api[0].host'
api.internal