use salvo::cors::Cors;
use salvo::http::Method;
use salvo::prelude::*;
#[tokio::main]
async fn main() {
// Initialize logging system
tracing_subscriber::fmt().init();
// Start both backend and frontend servers concurrently
tokio::join!(backend_server(), frontend_server());
}
async fn backend_server() {
// Handler that returns a simple message for CORS demonstration
#[handler]
async fn hello() -> &'static str {
"hello, I am content from remote server."
}
// Configure CORS middleware with specific settings:
// - Allow requests from localhost:8698
// - Allow specific HTTP methods
// - Allow authorization header
let cors = Cors::new()
.allow_origin(["http://127.0.0.1:8698", "http://localhost:8698"])
.allow_methods(vec![Method::GET, Method::POST, Method::DELETE])
.allow_headers("authorization")
.into_handler();
// Set up backend router with CORS protection
let router = Router::with_path("hello").post(hello);
let service = Service::new(router).hoop(cors);
// Start backend server on port 5600
let acceptor = TcpListener::new("0.0.0.0:5600").bind().await;
Server::new(acceptor).serve(service).await;
}
async fn frontend_server() {
// Handler that serves the HTML page with CORS test
#[handler]
async fn index() -> Text<&'static str> {
Text::Html(HTML_DATA)
}
// Set up frontend router to serve the test page
let router = Router::new().get(index);
// Start frontend server on port 8698
let acceptor = TcpListener::new("0.0.0.0:8698").bind().await;
Server::new(acceptor).serve(router).await;
}
// HTML template with JavaScript code to test CORS
// Contains a button that triggers a POST request to the backend server
const HTML_DATA: &str = r#"
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width">
<title>Salvo Cors</title>
</head>
<body>
<button id="btn">Load Content</button>
<div id="content"></div>
<script>
document.getElementById("btn").addEventListener("click", function() {
fetch("http://127.0.0.1:5600/hello", {method: "POST", headers: {authorization: "abcdef"}}).then(function(response) {
return response.text();
}).then(function(data) {
document.getElementById("content").innerHTML = data;
});
});
</script>
</body>
</html>
"#;
