What mechanisms do microservices use to interact with each other?

Microservices interact with each other using several main mechanisms:

• HTTP/REST API — the most common method, where services exchange data via HTTP requests using REST architecture.
• gRPC — a high-performance remote procedure call protocol that uses HTTP/2 and Protocol Buffers (protobuf) for serialization.
• Messaging through message brokers (e.g., RabbitMQ, Kafka) — asynchronous interaction where services exchange messages via a queue or topic.
• Event-driven architecture — services react to events published by other services.

Example of a simple HTTP call between microservices in Python using requests:

import requests

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