How can communication be configured between different microservices in a system?

Various approaches and tools are used to set up communication between microservices in a system:

1. HTTP/REST API — the most common method, where microservices communicate via HTTP requests using REST.

2. gRPC — a high-performance protocol with support for contracts through protobuf, suitable for internal interactions.

3. Messaging through message brokers (RabbitMQ, Kafka, Redis Pub/Sub) — asynchronous communication, useful for event-driven systems.

4. GraphQL — for more flexible data querying between services.

5. Service Mesh (e.g., Istio) — for managing communication, security, and monitoring between services.

An example of a simple REST call from one microservice in Python using requests:

import requests

response = requests.get('http://other-service/api/data')
if response.status_code == 200:
    data = response.json()
    print(data)

The choice of method depends on performance requirements, reliability, and system architecture.