restructure folders

unix-socket/Cargo.toml

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+[package]
+name = "unix-socket"
+version = "1.0.0"
+edition = "2021"
+
+[dependencies]
+env_logger = "0.9.0"
+actix-web = "4.0.0-rc.1"

unix-socket/README.md

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+## Unix domain socket example
+
+```bash
+cd other/unix-socket
+cargo run
+
+# in another shell
+curl --unix-socket /tmp/actix-uds.socket http://localhost/
+Hello world!
+```
+
+Although this will only one thread for handling incoming connections
+according to the [documentation](https://actix.github.io/actix-web/actix_web/struct.HttpServer.html#method.bind_uds).
+
+And it does not delete the socket file (`/tmp/actix-uds.socket`) when stopping
+the server, so it will fail to start next time you run it unless you delete
+the socket file manually.

unix-socket/src/main.rs

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+use actix_web::{middleware, web, App, HttpRequest, HttpServer};
+
+async fn index(_req: HttpRequest) -> &'static str {
+    "Hello world!"
+}
+
+#[actix_web::main]
+#[cfg(unix)]
+async fn main() -> std::io::Result<()> {
+    ::std::env::set_var("RUST_LOG", "actix_server=info,actix_web=info");
+    env_logger::init();
+
+    HttpServer::new(|| {
+        App::new()
+            // enable logger - always register Actix Web Logger middleware last
+            .wrap(middleware::Logger::default())
+            .service(
+                web::resource("/index.html")
+                    .route(web::get().to(|| async { "Hello world!" })),
+            )
+            .service(web::resource("/").to(index))
+    })
+    .bind_uds("/tmp/actix-uds.socket")?
+    .run()
+    .await
+}
+
+#[cfg(not(unix))]
+fn main() -> std::io::Result<()> {
+    println!("not supported");
+    Ok(())
+}