How to Handle CORS in Rust Web Applications

Use the tower-http crate's cors middleware to handle Cross-Origin Resource Sharing in Rust web applications. Add the dependency to your Cargo.toml and wrap your service with the CORS layer in main.rs.

use tower_http::cors::{Any, CorsLayer};
use tower::ServiceBuilder;

let cors = CorsLayer::new()
    .allow_origin(Any)
    .allow_methods(Any)
    .allow_headers(Any);

let app = ServiceBuilder::new()
    .layer(cors)
    .service(your_service);

CORS is a security rule that stops web browsers from letting your website talk to servers on different domains. This code tells your Rust server to explicitly allow those connections so your frontend can fetch data without errors. Think of it like giving a visitor a pass to enter a restricted building.