How to Build Serverless Applications in Rust

Build serverless applications in Rust by defining an async handler function that accepts a Request and returns a Response, then compile it for the wasm32-unknown-unknown target. Use the axum crate to define your routing logic and futures_executor to block on the response if running in a synchronous context.

use axum::{response::Html, routing::get, Router};
use http::Request;
use tower_service::Service;

async fn index() -> Html<&'static str> {
    Html("<h1>Hello, World!</h1>")
}

async fn app(request: Request<String>) -> Response {
    let router = Router::new().route("/api/", get(index));
    router.call(request).await.unwrap()
}

Compile your project for WebAssembly with the following command:

cargo build --target wasm32-unknown-unknown --release

Serverless applications in Rust are small, self-contained programs that run in response to specific events without managing servers. You write a function that handles incoming requests and returns a result, similar to a recipe that only runs when an order is placed. Rust compiles this code into a lightweight format that cloud providers can execute instantly.