Understanding asynchronous APIs
Blog post from Postman
Asynchronous APIs, such as WebSocket and gRPC, differ from synchronous APIs, like REST, by allowing continuous data streaming and parallel request handling, which enhances communication between services. Unlike synchronous APIs, which use HTTP for unidirectional data exchange requiring a new request for each data retrieval, asynchronous APIs utilize bidirectional protocols like HTTP/2, enabling persistent connections for ongoing data transfer. This allows applications to remain responsive, processing other tasks while awaiting API responses. Asynchronous APIs can notify applications of resource availability via callbacks, a feature not present in synchronous APIs. The flexibility of asynchronous APIs makes them ideal for microservices and event-driven architectures, where services communicate through message brokers and event subscriptions rather than constant polling. GraphQL, while typically synchronous, can support asynchronous messaging through WebSockets for real-time updates. The gRPC framework is favored for its efficient data streaming capabilities between internal services, supporting better scalability and performance, especially in high-activity applications.
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