Cargo can't do nested workspaces.

examples/easy-form-handling/src/main.rs

@@ -0,0 +1,35 @@
+// <easy-form-handling>
+use actix_web::{web, App, HttpResponse, HttpServer};
+use serde::Deserialize;
+
+#[derive(Deserialize)]
+struct Register {
+    username: String,
+    country: String,
+}
+
+fn index() -> HttpResponse {
+    HttpResponse::Ok()
+        .content_type("text/html; charset=utf-8")
+        .body(include_str!("../static/form.html"))
+}
+
+fn register(params: web::Form<Register>) -> actix_web::Result<HttpResponse> {
+    Ok(HttpResponse::Ok().body(format!(
+        "Hello {} from {}!",
+        params.username, params.country
+    )))
+}
+
+fn main() {
+    HttpServer::new(|| {
+        App::new()
+            .route("/", web::get().to(index))
+            .route("/register", web::post().to(register))
+    })
+    .bind("127.0.0.1:8088")
+    .unwrap()
+    .run()
+    .unwrap();
+}
+// </easy-form-handling>