Integrazione

REST API

Integrazione

3 min di lettura

Cos'e REST API?

A REST API is a web service interface that follows Representational State Transfer (REST) architectural principles, using standard HTTP methods to create, read, update, and delete resources. It is the most widely adopted API style for web and mobile applications.

What is a REST API?

A REST (Representational State Transfer) API is a web service that exposes data and functionality through URLs (endpoints) and uses standard HTTP methods to operate on resources. Defined by Roy Fielding in his 2000 doctoral dissertation, REST has become the dominant architecture for web APIs due to its simplicity, scalability, and alignment with how the web already works.

Core Principles

REST APIs adhere to several architectural constraints:

Stateless: Each request contains all the information the server needs to process it. The server does not store session state between requests.

Resource-based: Everything is modeled as a resource (users, orders, products) identified by a unique URL.

Standard methods: CRUD operations map to HTTP methods — GET (read), POST (create), PUT/PATCH (update), DELETE (remove).

Uniform interface: Consistent URL patterns, standard status codes, and self-descriptive responses make APIs predictable.

Client-server separation: The client and server evolve independently as long as the API contract is maintained.

Anatomy of a REST API Call

A typical REST interaction involves:

Endpoint: GET https://api.example.com/v2/users/42

Headers: Authentication tokens, content type (application/json), accept headers.

Request body (for POST/PUT): JSON payload with the resource data.

Response: Status code (200, 201, 404, etc.) plus a JSON body containing the requested resource or confirmation.

REST vs. GraphQL vs. gRPC

Feature	REST	GraphQL	gRPC
Data fetching	Fixed endpoints, fixed response shape	Client specifies exact fields	Protocol Buffers, strongly typed
Over/under-fetching	Common problem	Solved by design	Solved by design
Caching	HTTP caching built in	More complex	Requires custom caching
Learning curve	Low	Medium	Higher
Browser support	Native	Native (via HTTP)	Limited (needs proxy)
Adoption	Ubiquitous	Growing fast	Mostly internal services

Best Practices

Versioning: Include the API version in the URL (/v1/, /v2/) or headers to manage breaking changes.

Pagination: Return large collections in pages with limit, offset, or cursor-based parameters.

Filtering and sorting: Accept query parameters for server-side filtering (?status=active&sort=created_at).

Meaningful status codes: Use 201 for created, 204 for no content, 400 for bad requests, 401 for unauthorized, 429 for rate limited.

HATEOAS: Include links to related resources in responses so clients can discover the API dynamically.

Perche e Importante

REST APIs are the lingua franca of modern software. Nearly every SaaS product, cloud service, and mobile backend exposes a REST API. Understanding REST is essential for building integrations, automating workflows, and connecting disparate systems across your organization.

Come Autonoly lo Risolve

Autonoly's HTTP node lets you call any REST API endpoint directly within your workflows — configure the method, URL, headers, and body visually. Chain multiple API calls together, transform responses with built-in data mapping, and combine REST calls with browser automation for systems that lack APIs entirely.

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Esempi

Fetching a list of open support tickets from Zendesk's REST API and routing them based on priority
Creating new contacts in HubSpot via POST requests whenever a lead form is submitted
Updating inventory quantities in a warehouse management system's REST API after each sale

Domande Frequenti

Is REST the same as HTTP?

No. HTTP is the communication protocol that REST APIs use as their transport layer. REST is an architectural style that defines how to structure APIs on top of HTTP. You can use HTTP without following REST principles, and in theory REST could work over other protocols (though it almost never does in practice).

When should I use REST vs. GraphQL?

Use REST when you need simplicity, strong HTTP caching, or are building a public API that many different clients will consume. Use GraphQL when clients have varied data needs, you want to reduce the number of round trips, or you are building a frontend-heavy application that benefits from requesting exactly the data it needs.

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