Microservice Solution: HTTP API Calls

The microservice solution template uses the Integration Services to enable synchronous communication between microservices. This allows microservices to communicate with each other over HTTP requests. You can also use the Static or Dynamic C# clients to call the HTTP APIs of other microservices. However, the Integration Services is the recommended way to communicate between microservices because it allows you to hide your endpoints from the outside world and manage your services more easily.

Integration Service Configurations

By default, the Integration Services configurations do not expose the endpoints. To enable communication between microservices, you need to configure the Module class of your microservice project. The following code shows how to configure the Integration Services in the Module class:

public override void ConfigureServices(ServiceConfigurationContext context)
{
    ConfigureIntegrationServices();
}

private void ConfigureIntegrationServices()
{
    Configure<AbpAspNetCoreMvcOptions>(options =>
    {
        options.ExposeIntegrationServices = true;
    });
}

After exposing the Integration Services, you can call the HTTP APIs of other microservices from the related microservice projects. To do this, you need to use the Http.Client package for the respective microservice/module project. Next, you can set the endpoint URL of the related microservice in the appsettings.json file. The following code shows how to set the endpoint URL of the related microservice in the appsettings.json file:

"RemoteServices": {
    "AbpIdentity": {
        "BaseUrl": "http://localhost:44377"
    }
}

For a real-world example, inspect the Administration microservice, which communicates via HTTP with the Identity microservice.

When you enable the Integration Services, ensure that only the microservices within the cluster can access the endpoints. The existing gateway applications do not expose the Integration Service endpoints to the outside world.