Cargo can't do nested workspaces.

examples/request-routing/Cargo.toml

@@ -0,0 +1,7 @@
+[package]
+name = "request-routing"
+version = "0.1.0"
+edition = "2018"
+
+[dependencies]
+actix-web = "1.0"

examples/request-routing/src/main.rs

@@ -0,0 +1,23 @@
+// <request-routing>
+use actix_web::{web, App, HttpRequest, HttpResponse, HttpServer};
+
+fn index(_req: HttpRequest) -> HttpResponse {
+    HttpResponse::Ok().body("Hello from the index page.")
+}
+
+fn hello(path: web::Path<String>) -> HttpResponse {
+    HttpResponse::Ok().body(format!("Hello {}!", &path))
+}
+
+fn main() {
+    HttpServer::new(|| {
+        App::new()
+            .service(web::resource("/").to(index))
+            .service(web::resource("/{name}").to(hello))
+    })
+    .bind("127.0.0.1:8088")
+    .unwrap()
+    .run()
+    .unwrap();
+}
+// </request-routing>