App

As explained in Rust Servers, Services, and Apps

An Actix Web application object groups route configuration and processes incoming web requests.

An Actix Web app groups the routes an application can handle. The HTTP server requires an app for initialization, creates one app instance per worker thread, and routes each request through the app to the handler registered for its path and HTTP method. section 3.1.2

Configure an app by connecting request shapes to handlers and application behavior:

• Register a route with a path such as /health. section 3.1.2
• Associate an HTTP method, such as GET, with the route. section 3.1.2
• Forward matching requests to a handler that constructs the HTTP response. section 3.1.2
• Register API routes for creating courses, listing a tutor’s courses, and retrieving course details. section 3.2.1
• Let handlers parse parameters, read or write the in-memory store, and return successful or error responses. section 3.2.1

Health-check application

A browser sends GET /health to the listening Actix server. The server selects the app’s /health route, the app dispatches to health_check_handler(), and the handler returns an HTTP response containing the service status. The same application structure scales to the tutor-service routes, whose handlers use an in-memory course store. section 3.1.2 section 3.2.1

Figure 3.1 Components of the Actix web server

Trace how the HTTP server, app, routes, and handlers cooperate during request processing. section 3.1.2

How Rust Servers, Services, and Apps covers it

How deep it goes

Explains route matching, handler dispatch, worker instances, and request flow, but defers detailed application construction code.

Examples

Uses a /health endpoint and tutor-service course APIs backed initially by an in-memory data structure.

What it assumes

Assumes basic HTTP server, route, and handler concepts while establishing their Actix-specific relationships.

What you can do after

Builds an Actix application that dispatches health and REST requests to handlers and tests requests with a browser or curl.

How it connects

Connects HTTP servers, routes, handlers, application state, HTTP responses, and database access layers.

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Related concepts

• routinghas part · Routing is the selection of a path, destination, or processing component to direct an item, request, or flow toward an intended endpoint.
• web applicationkind of · A web application is software that provides functionality through web technologies and is accessed by users through a browser or other web client.
• applicationpart of · An application is a software program or system that performs tasks or provides functionality for users or other software systems.

This explainer was generated by Manning's knowledge graph from the text of Rust Servers, Services, and Apps. The section links point to the parts of the book it draws on.